If hard or traditional exercise is a problem motivation-wise or physically, you might want to try something like Pokémon Go. PG uses scammy mobile game tactics, which is normally bad, but it does help with motivation. You can also try ingress (which I can’t speak to), orna (does not use scammy tactics, and is better from a privacy standpoint, but is easier to put down as a result), or something similar. Walking outside is pretty low impact and a good way to get vitamin D. I have a much easier time setting off with a couple of bottles of water, some coffee, and a battery pack for a several hour long walk or just getting out of bed and going for a walk around the block if I know I’ll get something out of it in the short term as well.