And some exercises can be really intense, too! I have to repeat this over and over to people who complain about not being able or wanting to go to a gym: just start from (carefully) doing some squats or any other youtube-guided exercise in your living room! anything else is just an excuse they're forming in their head to cover for their lack of will to do it.

Try to do Saitama's training (from anime One Punch Man, just a tongue-in-cheek way to mean do lots of push-ups and squats) and afterwards tell me you don't feel like you've done some serious exercise!