swimming is the superior exercise. work your whole body and zero impact. the zero impact thing might not mean shit to most, but it will when you are 40 and played sports most of those 40 years lol. i used to play a lot of hockey and run like a champ, but have switched it up to kayaking/stand up paddleboarding/mountain biking/swimming. if i feel the need for contact i rock out some krav maga and bjj, they are still my guilty pleasure.