This challenge is simple + EFFECTIVE! The push-up is a foundational movement in strength training, and an exercise EVERYBODY can do. How many push-ups can YOU do continuously? Bonus points if you eventually add some resistance like some kiddos on your back.
Remember that FORM IS EVERYTHING!
Are straight leg push-ups too much? No worries at all! Just modify by doing your push-ups on an elevated surface, a wall, or feel free to bend your knees. I would rather you use good form and work up to increasing your intensity with time and practice.
If you practice these a little every day, YOU WILL GET STRONGER! Keep me posted with your progress