Try a “mixed” workout, kinda like jazzercise. You can make this up on your own and do it at home.
I like this circuit:
20 secs running in place
25 jumping jacks
20 secs high knees
30 “normal” mountain climbers (on your hands and toes, NOT the lunge jumps)
20 secs butt-kickers
16 “lunging” mountain climbers
If you keep going in between each set (don’t stop to rest) it strengthens your endurance and is a great cardio workout. Do it over as many times as needed. You can change it up and make it different too.