Choose seven exercises, do seven reps of each, and complete seven rounds, resting as needed. Pick a mix of lower-body, upperbody, and abdominal exercises, like jumps, ab twists, step-ups, mountain climbers, or others from the moves below.

While you’re watching YouTube or Hulu, hold a plank or a wall sit. Then, during those commercials you’re forced to watch, do something more active, like running in place, jumping jacks, sit-ups, or a high-knee march. 

This is a great one while you’re waiting outdoors. Pick a tree, a mailbox, or other landmark 50 to 100 feet away, and challenge yourself or a friend to get there by skipping, lunging, or high-knee running. Rest 10 to 20 seconds before you turn around, come back, and repeat with a new move.

Know the “12 Days of Christmas” song? Assign a different exercise to each day, and do the number of reps that correspond to the day. For example: “4 lunges, 3 ab twists, 2 high-knee marches, and 1 plank,” followed by, “5 mountain climbers, 4 lunges, 3 ab twists, 2 high-knee marches, and 1 plank.”

Assign each suit its own exercise—for example, spades = jumping jacks, hearts = squats, diamonds = sit-ups, and clubs = push-ups. Shuffle the deck, pick a card, and perform the number of reps on the card, then grab a new card. Pick a joker and rest!

Choose an exercise and rep count—for instance, 10 mountain climbers or 20 step-ups off a curb—and your partner has to follow your lead. Then switch.