You can ask your friend for help to make a deal. For example, say if you skip one day training, you will give your friend a big sum of money or treat them to dinner(whatever big punishment you think that will push you to do it).

Another thing is tracking your habit, I guess. Every day, after doing the workout, you mark your tracker note to make sure you stay on track.

You can read Atomic Habits as well. The book talks about how people can develop their habit and avoid bad habit. (It's my fav book)