KEEP YOUR SUMMER BODY TIGHT WITH THIS TRX HIIT WORKOUT Crank up the heat on your summer body with this short, sweet and sizzling-hot HIIT workout you can do anywhere. Excellent for anyone who doesn’t have much time but still wants to get great results, this high-intensity interval training workout gets your heart rate up and your waistline down. Perform each move for 30 seconds, resting only to transition to the next movement. Perform the entire sequence three to seven times, with a 1 minute rest at the end of the round.