I prefer to do one thing at a time, weight resistance OR aerobics. This tries to do both. Exercise regularly many yrs, can't do push ups, really hard. Am a breast cancer survivor, finished chemo., radiation, etc. At least 4 days a week, best if done daily, at least 20 mins.
Water is important during workouts.
No period for three months makes me non-energetic. You know, easy stuff and then increase your intensity as you feel better. Sounds like you have a good one. Do stomach exercises to keep the stomach muscles strong. I heard its the best product to buy for building muscle.