The 28-Day HIIT Challenge – Day 27

Rest for one minute after each round. Squat Sprint Jump Lunge Tiger Push-Up Seal Jump Burpee X-Jack

The 28-Day HIIT Challenge – Day 26

Total body challenge of 3 exercises x 3 sets x 3 rounds. Repeat each set three times before moving to the next. Rest 30 seconds at the end of each round. Cross-Country Seal Jump Lunge Mountain Climber Sprint 1-2 Push Burpee Star Squat Pedal Grasshopper

The 28-Day HIIT Challenge – Day 23

Sprint Squat Cross-Country Seal Mountain Climber X-Jack Push-Up Jack Jump Lunge Grasshopper Tiger Push-Up Burpee

The 28-Day HIIT Challenge – Day 21

Do each set three times. Rest for 30 seconds after each set. Total Time: 45m Warm Up Workout

The 28-Day HIIT Challenge – Day 19

Sprint Cross-Country Seal Power Knee Mountain Climber X-Jack The Mummy Reach Burpee Squat High Knee Jump Lunge

The 28-Day HIIT Challenge – Day 16

Push-Up Squat Jumping Jack Plank Hold Cross Push Jump Lunge Tricep Dip Burpee 1-2 Push Squat Pedal Crab Touch Alternating Leg lift Burpee

The 28-Day HIIT Challenge – Day 15

For all levels, repeat the set four times. Rest for one minute after each set. Sprint Plank Jumping Jack Plank Rotation Squat Burpee Push-Up Seal Jack Plank Punch Squat Jump Alternating Leg Lift Burpee 1-2 Push Star In-and-Out Abs Squat Pedal

The 28-Day HIIT Challenge – Day 14

High Knees Grasshopper Burpee Spiderman Star Ball Press Jump Lunge Reach Side Suicides Squat Pedal Ski Jump Sphinx Power Knee Squat Jump 1-2 Push

The 28-Day HIIT Challenge – Day 6

Each set in this workout is engineered to work as many muscle groups as possible, super-charging your metabolism. Remember form is especially important – quality trumps quantity! Sprint Cross-Country Seal X-Jack Mountain Climber Squat Reverse lunge Squat Jump Jump Lunge Power Knee Burpee Tiger Push-Up