The moves in this no-equipment workout have a few things in common: they're basic, functional, and scalable as your level of fitness improves. So while this simple body-weight workout may not seem like much, as you repeat the circuit, you'll learn just how effective it can be. You can time yourself so that as you get better, you can race against your previous times.
Alternating lunges means alternate lunging forward with your right, then left (five times on each side). Check out our tips on how to do a reverse crunch here as well as how to do jumping squats here.