The 7-Day HIIT Challenge – Day 7

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

The 7-Day HIIT Challenge – Day 6

Rest for one minute after each round. Sprint Mountain Climber Cross Jack Crab Touch Side Suicides Tiger Push Up Skater Jump Russian Twist

The 7-Day HIIT Challenge – Day 5

Unlike doing endless crunches that focus only on the six-pack abs (rectus abdominis), these exercises together create a set that will attack your entire core. Let me know how the core killer set works out for you! V-Up Double Cross Reach Sprinter Sit Up Plank Punch

The 7-Day HIIT Challenge – Day 2

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