Working out is a vital part of a healthty lifestyle and I always wondered how much physics is involved in it. Working out takes a lot of work because work equals force times distance. The amount of work I put in is based on my force and distance. For example, when I lift weights, the heavier the weight and the higher distance I lift, the more work I put in.
Also, an important part of working out it doing cardio. I like to run fast so I need my velocity to increase. Average velocity equals distance divided by time, so when I am on the treadmill I try to run two miles as fast as I can so I have a high velocity.
Overall, working out has a lot of physics involved!