No doubt it's taking some effort to do these, but the moves you are doing would not be considered "true" pushups, bodyweight squats, or sit ups. For example, on the push ups you're lowering your hips all the way to the ground first, then your entire body. Coming up, you're peeling your chest off the floor before raising your hips up.
I commend you for this challenge, but can't help but wonder why you don't lower the number and do strict forms of these moves. For example, what if you did 100 strict push ups, rather than 1000 of that thing you're doing? I think you'd get more out of it.