What do y’all do for exercise?

My psychiatrist and other doctors always say I need to exercise more. What’s y’alls favorite ways to get some activity in? I need something I can do inside every day. It’s way too hot to do what I would like - tennis, soccer, basketball, running. I plan on trying to lift weights like I used to enjoy but I would love to hear what works for y’all in case it doesn’t work out. Not only the activity but how do you get yourself to actually do it? Thanks friends! :)