diff --git a/rowers/dataprep.py b/rowers/dataprep.py
index 2a8597d5..e3aca775 100644
--- a/rowers/dataprep.py
+++ b/rowers/dataprep.py
@@ -721,23 +721,33 @@ def update_rolling_cp(r, types, mode='water'):
     powerdf.drop_duplicates(subset='Delta', keep='first', inplace=True)
 
     res2 = datautils.cpfit(powerdf)
+    p1 = res2[0]
+    # calculate FTP
+    hourseconds = 3600.
+    pwr = p1[0]/(1+hourseconds/p1[2])
+    pwr += p1[1]/(1+hourseconds/p1[3])
+
     if len(powerdf) != 0:
         if mode == 'water':
-            p1 = res2[0]
             r.p0 = p1[0]
             r.p1 = p1[1]
             r.p2 = p1[2]
             r.p3 = p1[3]
             r.cpratio = res2[3]
             r.save()
+            if pwr > r.ftp*(100.-r.otwslack)/100. and r.getemailnotifications and not r.emailbounced:
+                _ = myqueue(queuehigh, handle_sendemail_newftp(r,pwr,'water'))
+            
         else:
-            p1 = res2[0]
             r.ep0 = p1[0]
             r.ep1 = p1[1]
             r.ep2 = p1[2]
             r.ep3 = p1[3]
             r.ecpratio = res2[3]
             r.save()
+            if pwr > r.ftp and r.getemailnotifications and not r.emailbounced:
+                _ = myqueue(queuehigh, handle_sendemail_newftp(r,pwr,'water'))
+
 
         return True
     return False
diff --git a/rowers/models.py b/rowers/models.py
index feeffc02..36c2cb0f 100644
--- a/rowers/models.py
+++ b/rowers/models.py
@@ -4237,9 +4237,21 @@ class SimpleRowerPowerForm(ModelForm):
         return super(SimpleRowerPowerForm, self).save(*args, **kwargs)
 
 class RowerPowerForm(ModelForm):
+    otwftp = forms.IntegerField(initial=0,required=False, label='FTP on water')
     class Meta:
         model = Rower
-        fields = ['hrftp', 'ftp', 'otwslack','cogganzones']
+        fields = ['hrftp', 'ftp','cogganzones']
+
+    field_order = ['hrftp', 'ftp', 'otwftp', 'cogganzones']
+
+    def __init__(self, *args, **kwargs):
+        super(RowerPowerForm, self).__init__(*args, **kwargs)
+        self.initial['otwftp'] = int((1-0.01*self.instance.otwslack)*self.instance.ftp)
+
+    def save(self, *args, **kwargs):
+        otwslack = -100.*(self.cleaned_data['otwftp']-self.cleaned_data['ftp'])/(self.cleaned_data['ftp'])
+        self.instance.otwslack = otwslack
+        return super(RowerPowerForm, self).save(*args, **kwargs)
 
 
 class RowerCPForm(ModelForm):
diff --git a/rowers/tasks.py b/rowers/tasks.py
index cf6c0c23..951710ed 100644
--- a/rowers/tasks.py
+++ b/rowers/tasks.py
@@ -1712,6 +1712,24 @@ def handle_sendemail_expired(useremail, userfirstname, userlastname, expireddate
                             d, cc=['support@rowsandall.com'], **kwargs)
     return 1
 
+@app.task
+def handle_sendemail_newftp(power,rower,mode, **kwargs):
+    subject = "You may want to update your FTP on rowsandall.com"
+    from_email = 'Rowsandall <info@rowsandall.com>'
+
+    d = {
+        'first_name': rower.user.first_name,
+        'last_name': rower.user.last_name,
+        'siteurl': siteurl,
+        'ftp': r.ftp,
+        'newftp': power,
+    }
+
+    _ = send_template_email(from_email, [r.user.email],
+                            subject, 'newftpemail.html',
+                            d, **kwargs)
+
+    return 1
 
 @app.task
 def handle_sendemail_breakthrough(workoutid, useremail,
diff --git a/rowers/templates/menu_profile.html b/rowers/templates/menu_profile.html
index 554a5a63..0beb4987 100644
--- a/rowers/templates/menu_profile.html
+++ b/rowers/templates/menu_profile.html
@@ -2,9 +2,9 @@
 {% load rowerfilters %}
 <h1><a href="/rowers/me/edit/">Profile</a></h1>
 <ul class="cd-accordion-menu animated">
-  <li id="manage-prefs">
-    <a href="/rowers/me/preferences/">
-      <i class="fas fa-cog fa-fw"></i>&nbsp;Zones & Fitness
+  <li id="manage-prefs-simple">
+    <a href="/rowers/me/prefs/">
+      <i class="fas fa-sliders-v-square fa-fw"></i>&nbsp;Threshold
     </a>
   </li>
   <li id="manage-impex">
@@ -27,6 +27,11 @@
       <i class="fas fa-tachometer-alt-slow fa-fw"></i>&nbsp;Manage Workflow
     </a>
   </li>
+  <li id="manage-prefs">
+    <a href="/rowers/me/preferences/">
+      <i class="fas fa-cog fa-fw"></i>&nbsp;Zones & Fitness, detailed
+    </a>
+  </li>
   {% if user.is_authenticated and user.is_staff %}
   <li id="manage-transactions">
     <a href="/rowers/me/transactions/">
diff --git a/rowers/templates/rower_simplepreferences.html b/rowers/templates/rower_simplepreferences.html
index b7b697be..56801cd7 100644
--- a/rowers/templates/rower_simplepreferences.html
+++ b/rowers/templates/rower_simplepreferences.html
@@ -17,6 +17,19 @@
       <input type="submit" value="Update">
     </form>
   </li>
+  <li class="grid_2">
+    <p>
+      The Functional Threshold Power (FTP) is the power you can hold
+      for an hour all out. If you haven't done a full out hour, you
+      can also take a full out 20 minutes effort and take 95% of it.
+    </p>
+    <p>
+      If you do not row with a power meter on the water, the FTP on
+      water is irrelevant. If you do not know your 20 minute or full
+      hour full out power value on the water, take 85% of your indoor
+      rowing value.
+    </p>
+  </li>
 </ul>
 
 
diff --git a/rowers/tests/test_user.py b/rowers/tests/test_user.py
index c7ad696d..77ed9f00 100644
--- a/rowers/tests/test_user.py
+++ b/rowers/tests/test_user.py
@@ -234,7 +234,7 @@ class UserPreferencesTest(TestCase):
         form_data = {
             'hrftp': 160,
             'ftp':230,
-            'otwslack':14
+            'otwftp':224
             }
 
         form = RowerPowerForm(form_data)
diff --git a/rowers/views/statements.py b/rowers/views/statements.py
index 93a8350d..71179ffc 100644
--- a/rowers/views/statements.py
+++ b/rowers/views/statements.py
@@ -242,6 +242,7 @@ from rowers.rows import handle_uploaded_file, handle_uploaded_image
 from rowers.plannedsessions import *
 from rowers.tasks import handle_makeplot, handle_otwsetpower, handle_sendemailtcx, handle_sendemailcsv
 from rowers.tasks import (
+    handle_sendemail_newftp,
     instroke_static,
     fetch_rojabo_session,
     handle_sendemail_unrecognized, handle_sendemailnewcomment,
diff --git a/rowers/views/userviews.py b/rowers/views/userviews.py
index 93aded31..f5e9a257 100644
--- a/rowers/views/userviews.py
+++ b/rowers/views/userviews.py
@@ -650,14 +650,13 @@ def rower_prefs_view(request, userid=0, message=""):
             successmessage = "Your Heart Rate data were changed"
             messages.info(request, successmessage)
     elif request.method == 'POST' and "ftp" in request.POST:
-        powerform = RowerPowerForm(request.POST)
+        powerform = RowerPowerForm(request.POST, instance=r)
         if powerform.is_valid():
+            powerform.save(commit=True)
             cd = powerform.cleaned_data
             hrftp = cd['hrftp']
             if hrftp == 0:  # pragma: no cover
                 hrftp = int((r.an+r.tr)/2.)
-            ftp = cd['ftp']
-            otwslack = cd['otwslack']
             cogganzones = cd['cogganzones']
 
             powerfrac = 100*np.array([r.pw_ut2,
@@ -674,7 +673,6 @@ def rower_prefs_view(request, userid=0, message=""):
                           'Anaerobic']
                 r.powerzones = powerzones
 
-            r.ftp = max(min(ftp, 650), 50)
             ut2, ut1, at, tr, an = (r.ftp*powerfrac/100.).astype(int)
             r.pw_ut2 = ut2
             r.pw_ut1 = ut1
@@ -682,7 +680,6 @@ def rower_prefs_view(request, userid=0, message=""):
             r.pw_tr = tr
             r.pw_an = an
             r.hrftp = hrftp
-            r.otwslack = max(min(otwslack, 50), 0)
             r.save()
             powerzonesform = RowerPowerZonesForm(instance=r)
 
diff --git a/templates/newbase.html b/templates/newbase.html
index bba499a9..6e77fffd 100644
--- a/templates/newbase.html
+++ b/templates/newbase.html
@@ -156,7 +156,7 @@
           </li>
 	  {% if user.is_authenticated %}
           <li>
-            <a href="/rowers/me/preferences/" title="Profile">
+            <a href="/rowers/me/prefs/" title="Profile">
               {% if user.rower.rowerplan == 'pro' %}
               <i class="fas fa-user-ninja "></i>
               {% elif 'coach' in user.rower.rowerplan %}