This workout is probably my favorite HIIT workouts yet! It definitely one that will leave you dripping in sweat. I love it because you have 4 rounds that are 4 minutes long and you compete against yourself to see how many moves you can fit into each round. I love how I can track my progress and see my improvement each time I do this workout. The best part? No equipment needed and this workout can be done in your home in 20 minutes! I tracked and you burn about 300+ calories in this workout. Get me the 4X4 HIIT workout! >>>
