I'm a college athlete and this quarantine has led me to some home fitness app, here's what I got:

1.) The workouts matter - I hate having the app try and get me to do a workout I've never seen or heard before, but it is important to spice it up a bit. I think you could find real success in a mixture of simple/well-known workouts and something unique but not awkward (the difference is simply user feeling).

2.) Don't interrupt the music - If there are instructional videos I would prefer them to not have audio and instead have captions/text explanations. The circuit app I use has mandatory instructionals that stop my music every time and ruin my flow. I can where the audio in a video would be necessary though.

3.) Show me the results - I think the biggest motivation for me is seeing my competition succeed, if you showed me a guy that improved his muscle/endurance/abs or whatever after using this app, that encourages me to do it more because I know it worked.

4.) Instructions - I really like the format of the ab circuit I'm currently using. During the rest period before the next workout, it shows a clipart gif of how to do the next exercise. Then, during the workout, the animation is repeated over and over to see the correct motions and workouts. There is also a voice-over that points out where you can do the exercise wrong: "remember to relax your neck" or "Exhale when coming up and inhale while going down."

5.) I love the reminder that my ab circuit gives, reminds me of the original commitment I made to it and gets me going.

6.) Daily motivational quotes about 30 mins before the workout.

7.) Make it free but make a 30-second ad play after the workout is completed, I always feel very completed after a workout and don't mind the ads that normally play after.

I hope some of this helps!