My substitute for running is air squats

Air squats are my go-to for cardio since I injured my heel, I have not been able to run. We do one hundred air squats during our 2.5-mile walk. We stopped at the lake on the way back and after walking about 2 miles. After the air squats we continue our walk, which is about a half a mile.

1000 Air squats at home

The video below is me doing air squats at home. I was supposed to work out my legs with my dumbbells, but I was tired, so I decided to make it a light day and do cardio at the same time. I got this idea for doing air squats a long time ago from a UFC fighter named Ken Shamrock. He was one of my favorites back in the early days of UFC. Shamrock stated that for cardio he did 500 air squats a day. I was in shape back in those days so when I tried to do the 500 air squats, I was able to do them after one week. The video below is me doing me air squatting at home as a substitute for leg day and to get cardio in. I did 1000 air squats below in my bedroom filming it with my Samsung S21 Ultra. I apologize for the background noise and any interruptions.