If you signed up through iTunes:
Go into your App Store '' app → Click on your Profile in the upper right hand corner → Subscriptions → Find your Fit Body app subscription and hit cancel.
If you signed up through Google Play:
Launch the Google Play Store '' app. Tap Menu → My Apps → Subscriptions and tap on Fit Body app → Click Cancel and Yes to confirm.
If you signed up through our website, join.fitbodyapp.com:
Go to join.fitbodyapp.com → Sign into your account and you'll be at your Account Profile page and from there you see the option to cancel on the right side →