Jump rope and do squats!
ONLY if you wanna live a longer more active life at least you should do these two things. Science has shown a direct correlation between leg strength and longer life. When you get older having stronger legs means your body is breaking down less and you’re still able to get around on your own. Less likely to have to move into a nursing home and stronger legs through squatting means stronger bones and less injury. Couple jumping rope which give you fast feet and that means less tripping and falling to the ground. The faster you can get your feet back under your body the less likely you are to hit the ground and break something.
So forget the fact that jumping rope is excellent cardio and squats make your ass look fantastic, think about you later years and start NOW.