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 22

Perform each set three times before doing the next. Rest for 30 seconds between sets. Sprint X-Jack Seal Jack Mountain Climber Squat Reverse Lunge Squat Jump Jump Lunge Plank Punch Speed Skater Mogul Jump Star High Knees 1-2 Push Pike Double Cross

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 18

Yelling, “I’m a star!” as loudly as possible is optional during this routine, but highly recommended! That brief moment of levity may make you forget how much your legs and legs are burning during this blockbuster workout. X-Jack Jump Lunge Star Cross Push

The 28-Day HIIT Challenge – Day 17

Perform each set three times before moving to the next. Rest for 30 seconds between sets. Sprint High Knees Jumping Jack The Mummy Squat Reverse Lunge Lateral Lunge Squat Hold Plank Cross Jack Push Up Tricep Dip Pike Side Bend Russian Twist

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