I can definitely understand that. It's a wierd paradox, though, that getting exercise will actually give you more energy, and the mobility you gain will make injuries heal better. If you can do a simple bodyweight workout just for a couple months, you won't regret it.

Do body weight exercises at work instead of Lemmy.

Only if you want to though.

Wake up earlier and do it in the morning when you’re not tired, and don’t do knee exercises until it heals.

Exercise only works if you make it a routine/lifestyle, like brushing your teeth. It’s one of the few things in life that is all positives with zero downsides.