diff --git a/rowers/dataprep.py b/rowers/dataprep.py
index 0d575328..b4acbd56 100644
--- a/rowers/dataprep.py
+++ b/rowers/dataprep.py
@@ -1421,7 +1421,7 @@ def add_efficiency(id=0):
 # saves it to the stroke_data table in the database
 # Takes a rowingdata object's DataFrame as input
 def dataprep(rowdatadf,id=0,bands=True,barchart=True,otwpower=True,
-             empower=True,inboard=0.88):
+             empower=True,inboard=0.88,forceunit='lbs'):
     if rowdatadf.empty:
         return 0
 
@@ -1485,8 +1485,17 @@ def dataprep(rowdatadf,id=0,bands=True,barchart=True,otwpower=True,
     except TypeError:
         drivespeed = 0.0*rowdatadf['TimeStamp (sec)']
         
+
     drivespeed = drivespeed.fillna(value=0)
-    driveenergy = drivelength*averageforce*lbstoN
+
+    try:
+        driveenergy = rowdatadf['driveenergy']
+    except KeyError:
+        if forceunit == 'lbs':
+            driveenergy = drivelength*averageforce*lbstoN
+        else:
+            drivenergy = drivelength*averageforce
+        
     distance = rowdatadf.ix[:,'cum_dist']
 
     
diff --git a/rowers/interactiveplots.py b/rowers/interactiveplots.py
index c71e3504..fb3d2ab1 100644
--- a/rowers/interactiveplots.py
+++ b/rowers/interactiveplots.py
@@ -1918,7 +1918,6 @@ def interactive_flex_chart2(id=0,promember=0,
         yparam1 = 'None'
         
     rowdata.dropna(axis=1,how='all',inplace=True)
-    rowdata.dropna(axis=0,how='any',inplace=True)
 
     # test if we have drive energy
     nowork = 1
diff --git a/rowers/templates/histo.html b/rowers/templates/histo.html
index fe9b1024..11fd08eb 100644
--- a/rowers/templates/histo.html
+++ b/rowers/templates/histo.html
@@ -5,15 +5,57 @@
 {% block title %}View Workout {% endblock %}
 
 {% block content %}
+<script src="https://code.jquery.com/jquery-1.9.1.min.js"></script>
+<script>
+  $(function() {
+  
+  // Get the form fields and hidden div
+  var checkbox = $("#id_water");
+  var hidden = $("#id_waterboattype");
 
-	<script type="text/javascript" src="/static/js/bokeh-0.12.3.min.js"></script>
-	<script async="true" type="text/javascript">
-    Bokeh.set_log_level("info");
-	</script>
+  
+  // Hide the fields.
+  // Use JS to do this in case the user doesn't have JS 
+  // enabled.
 
-	{{ interactiveplot |safe }}
+  hidden.hide();
 
-    <script>
+  
+  // Setup an event listener for when the state of the 
+  // checkbox changes.
+  checkbox.change(function() {
+    // Check to see if the checkbox is checked.
+    // If it is, show the fields and populate the input.
+    // If not, hide the fields.
+    if (checkbox.is(':checked')) {
+  // Show the hidden fields.
+  hidden.show();
+  } else {
+  // Make sure that the hidden fields are indeed
+  // hidden.
+  hidden.hide();
+      
+      // You may also want to clear the value of the 
+      // hidden fields here. Just in case somebody 
+      // shows the fields, enters data to them and then 
+      // unticks the checkbox.
+      //
+      // This would do the job:
+      //
+      // $("#hidden_field").val("");
+    }
+  });
+});
+</script>
+
+<script type="text/javascript" src="/static/js/bokeh-0.12.3.min.js"></script>
+<script async="true" type="text/javascript">
+  Bokeh.set_log_level("info");
+</script>
+
+{{ interactiveplot |safe }}
+
+<script>
     // Set things up to resize the plot on a window resize. You can play with
     // the arguments of resize_width_height() to change the plot's behavior.
     var plot_resize_setup = function () {
@@ -37,9 +79,9 @@
 <div id="title" class="grid_12 alpha">
   <div class="grid_10 alpha">
     {% if theuser %}
-    <h3>{{ theuser.first_name }}'s Indoor Rower Power Histogram</h3>
+    <h3>{{ theuser.first_name }}'s Stroke Analysis</h3>
     {% else %}
-    <h3>{{ user.first_name }}'s Indoor Rower Power Histogram</h3>
+    <h3>{{ user.first_name }}'s Stroke Analysis</h3>
     {% endif %}
   </div>
   <div class="grid_2 omega">
@@ -50,51 +92,64 @@
       </button>
       <div class="dropdown-content">
         {% for member in user|team_members %}
-        <a class="button green small" href="/rowers/{{ member.id }}/histo/{{ startdate|date:"Y-m-d" }}/{{ enddate|date:"Y-m-d" }}">{{ member.first_name }} {{ member.last_name }}</a>
+        <a class="button green small" href="/rowers/{{ member.id }}/flexall/{{ xparam }}/{{ yparam1 }}/{{ yparam2 }}/{{ startdate|date:"Y-m-d" }}/{{ enddate|date:"Y-m-d" }}">{{ member.first_name }} {{ member.last_name }}</a>
         {% endfor %}
+      </div>
+      {% else %}
+      &nbsp;
+      {% endif %}
+    </div>
+  </div>
+  
+  <div class="grid_12 alpha">
+    <div id="form" class="grid_6 alpha">
+      <p>Warning: Large date ranges may take a long time to load. Huge date ranges may crash your browser.</p>
+      <form enctype="multipart/form-data" action="{{ formloc }}" method="post">
+        {% csrf_token %}
+        <div class="grid_2 alpha">
+          <table>
+            {{ optionsform.as_table }}
+          </table>
+        </div>
+        <div class="grid_2 suffix_2 omega">
+          <input type="hidden" name="options" value="options">
+          <input class="grid_1 alpha button green small" value="Submit" type="Submit">
+        </div>
+      </form>
+    </div>
+    <div class="grid_6 omega">
+      <p>Use this form to select a different date range:</p>
+      <p>
+        Select start and end date for a date range:
+        <div class="grid_4 alpha">
+          
+          <form enctype="multipart/form-data" action="" method="post">
+            
+            <table>
+              {{ form.as_table }}
+            </table>
+            {% csrf_token %}
+        </div>
+        <div class="grid_2 omega">
+          <input name='daterange' class="button green" type="submit" value="Submit">	</form>
+        </div>
+        <div class="grid_4 alpha">
+          <form enctype="multipart/form-data" action="" method="post">
+	    Or use the last {{ deltaform }} days.
+        </div>
+        <div class="grid_2 omega">
+          {% csrf_token %}
+          <input name='datedelta' class="button green" type="submit" value="Submit">
+        </form>
+        </div>
     </div>
-    {% else %}
-    &nbsp;
-    {% endif %}
   </div>
-</div>
 
-<div id="summary" class="grid_6 alpha">
-
-
-
-	<p>Summary for {{ theuser.first_name }} {{ theuser.last_name }}
-		between {{ startdate|date }} and {{ enddate|date }}</p>
-
-	<p>Direct link for other Pro users:
-	<a href="/rowers/{{ id }}/histo/{{ startdate|date:"Y-m-d" }}/{{ enddate|date:"Y-m-d" }}">https://rowsandall.com/rowers/{{ id }}/histo/{{ startdate|date:"Y-m-d" }}/{{ enddate|date:"Y-m-d" }}</a>
-	</p>
-</div>
-<div id="form" class="grid_6 omega">
-	<p>Use this form to select a different date range:</p>
-	<p>
-	Select start and end date for a date range:
-	<div class="grid_4 alpha">
-
-	<form enctype="multipart/form-data" action="" method="post">
-
-        	<table>
-            	{{ form.as_table }}
-        	</table>
-        	{% csrf_token %}
-	</div>
-	<div class="grid_2 omega">
-        <input name='daterange' class="button green" type="submit" value="Submit">	</form>
-	</div>
-	<div class="grid_4 alpha">
-	<form enctype="multipart/form-data" action="" method="post">
-	Or use the last {{ deltaform }} days.
-	</div>
-	<div class="grid_2 omega">
-	{% csrf_token %}
-        <input name='datedelta' class="button green" type="submit" value="Submit">
-    	</form>
-	</div>
+  <div id="summary" class="grid_6 suffix_6 alpha">
+    
+    <p>Summary for {{ theuser.first_name }} {{ theuser.last_name }}
+      between {{ startdate|date }} and {{ enddate|date }}</p>
+  </div>
 </div>
 
 <div id="graph" class="grid_12 alpha">
diff --git a/rowers/views.py b/rowers/views.py
index beb6ecd0..108f04ef 100644
--- a/rowers/views.py
+++ b/rowers/views.py
@@ -2039,7 +2039,45 @@ def rower_process_testcallback(request):
 
 # View around the Histogram of all strokes. Not implemented in UI
 @login_required()
-def histo_all(request,theuser=0):
+def histo_all(request,theuser=0,
+	      startdate=timezone.now()-datetime.timedelta(days=10),
+	      enddate=timezone.now()+datetime.timedelta(days=1),
+	      deltadays=-1,
+	      startdatestring="",
+	      enddatestring="",
+              options={
+                  'includereststrokes':False,
+                  'workouttypes':['rower','dynamic','slides'],
+                  'waterboattype':['1x','2x','2-','4x','4-','8+']
+              }):
+    
+    if 'options' in request.session:
+        options = request.session['options']
+
+    workouttypes = options['workouttypes']
+    includereststrokes = options['includereststrokes']
+    waterboattype = options['waterboattype']
+    workstrokesonly = not includereststrokes
+
+
+    checktypes = ['water','rower','dynamic','slides','skierg',
+                  'paddle','snow','coastal','other']
+
+    
+    if deltadays>0:
+	startdate = enddate-datetime.timedelta(days=int(deltadays))
+
+    if startdatestring != "":
+	startdate = iso8601.parse_date(startdatestring)
+
+    if enddatestring != "":
+	enddate = iso8601.parse_date(enddatestring)
+
+    if enddate < startdate:
+	s = enddate
+	enddate = startdate
+	startdate = s
+
     promember=0
     if theuser == 0:
 	theuser = request.user.id
@@ -2192,6 +2230,7 @@ def cum_flex(request,theuser=0,
                 'workouttypes':workouttypes,
                 'waterboattype':waterboattype,
                 }
+            request.session['options'] = options
             form = DateRangeForm(initial={
 	    'startdate': startdate,
 	    'enddate': enddate,
@@ -2391,7 +2430,24 @@ def histo(request,theuser=0,
 	  enddate=timezone.now(),
 	  deltadays=-1,
 	  startdatestring="",
-	  enddatestring=""):
+	  enddatestring="",
+             options={
+                 'includereststrokes':False,
+                 'workouttypes':['water','rower','dynamic','slides'],
+                 'waterboattype':['1x','2x','2-','4x','4-','8+']
+             }):
+
+    if 'options' in request.session:
+        options = request.session['options']
+
+    workouttypes = options['workouttypes']
+    includereststrokes = options['includereststrokes']
+    waterboattype = options['waterboattype']
+    workstrokesonly = not includereststrokes
+
+
+    checktypes = ['water','rower','dynamic','slides','skierg',
+                  'paddle','snow','coastal','other']
 
     if deltadays>0:
 	startdate = enddate-datetime.timedelta(days=int(deltadays))
@@ -2426,6 +2482,7 @@ def histo(request,theuser=0,
     if request.method == 'POST' and "daterange" in request.POST:
 	form = DateRangeForm(request.POST)
 	deltaform = DeltaDaysForm(request.POST)
+        optionsform = StatsOptionsForm()
 	if form.is_valid():
 	    startdate = form.cleaned_data['startdate']
 	    enddate = form.cleaned_data['enddate']
@@ -2435,6 +2492,7 @@ def histo(request,theuser=0,
 		startdate = s
     elif request.method == 'POST' and "datedelta" in request.POST:
 	deltaform = DeltaDaysForm(request.POST)
+        optionsform = StatsOptionsForm()
 	if deltaform.is_valid():
 	    deltadays = deltaform.cleaned_data['deltadays']
 	    if deltadays != 0 and deltadays != None:
@@ -2450,6 +2508,36 @@ def histo(request,theuser=0,
 		    })
             else:
                 form = DateRangeForm()
+                optionsform = StatsOptionsForm()
+    elif request.method == 'POST' and 'options' in request.POST:
+        optionsform = StatsOptionsForm(request.POST)
+        if optionsform.is_valid():
+            includereststrokes = optionsform.cleaned_data['includereststrokes']
+            workstrokesonly = not includereststrokes
+            waterboattype = optionsform.cleaned_data['waterboattype']
+            workouttypes = []
+            for type in checktypes:
+                if optionsform.cleaned_data[type]:
+                    workouttypes.append(type)
+                    
+                    
+            options = {
+                'includereststrokes':includereststrokes,
+                'workouttypes':workouttypes,
+                'waterboattype':waterboattype,
+                }
+            request.session['options'] = options
+            form = DateRangeForm(initial={
+	    'startdate': startdate,
+	    'enddate': enddate,
+	    })
+            deltaform = DeltaDaysForm()
+        else:
+            form = DateRangeForm(initial={
+	    'startdate': startdate,
+	    'enddate': enddate,
+	    })
+            deltaform = DeltaDaysForm()
 
     else:
 	form = DateRangeForm(initial={
@@ -2457,11 +2545,12 @@ def histo(request,theuser=0,
 	    'enddate': enddate,
 	    })
 	deltaform = DeltaDaysForm()
-
+        optionsform = StatsOptionsForm()
     try:
 	r2 = getrower(theuser)
 	allergworkouts = Workout.objects.filter(user=r2,
-						workouttype__in=['rower','dynamic','slides'],
+						workouttype__in=workouttypes,
+                                                boattype__in=waterboattype,
 						startdatetime__gte=startdate,
 						startdatetime__lte=enddate)
 	
@@ -2480,8 +2569,28 @@ def histo(request,theuser=0,
 	div = res[1]
     else:
 	script = ''
-	div = '<p>No erg pieces uploaded for this date range.</p>'
+        typesstring = ', '.join('{}'.format(item) for i,item in enumerate(workouttypes))
+        if 'water' in workouttypes:
+            boatsstring = 'water ('+', '.join('{}'.format(item) for i,item in enumerate(waterboattype))+')'
+            typesstring = typesstring.replace('water',boatsstring)
+	div = '<p>No pieces found for '+typesstring+' for this date range.</p>'
 
+    # set options form correctly
+    initial = {}
+    initial['includereststrokes'] = includereststrokes
+
+    initial['waterboattype'] = waterboattype
+
+    for wtype in checktypes:
+        if wtype in workouttypes:
+            initial[wtype] = True
+        else:
+            initial[wtype] = False
+
+
+    optionsform = StatsOptionsForm(initial=initial)
+        
+    request.session['options'] = options
 
     return render(request, 'histo.html',
 		  {'interactiveplot':script,
@@ -2491,6 +2600,7 @@ def histo(request,theuser=0,
 		   'startdate':startdate,
 		   'enddate':enddate,
 		   'form':form,
+                   'optionsform':optionsform,
 		   'deltaform':deltaform,
                    'teams':get_my_teams(request.user),
 		   })
@@ -5208,6 +5318,7 @@ def cumstats(request,theuser=0,
                 'workouttypes':workouttypes,
                 'waterboattype':waterboattype,
                 }
+            request.session['options'] = options
             form = DateRangeForm()
             deltaform = DeltaDaysForm()
         else: