I have moderately severe asthma and it took a long time to retrain my lungs so to say. Start small. Dance around the house. If you get winded, take a break. I used to do a check list of 50 reps of the following:
Crunches, jumping jacks, modified push ups, squats, boxer punches. As long you're moving, you're losing calories. You just have to know when to stop to take a break. I have to drink a ton of water and caffeine ( like a cup of coffee) before always helps open my airways. If I know I am gonna get an attack or I feel tight, I use my inhaler as an anticedent. Good luck
