rossboxing.comtons of ideas for at-home, small-space workouts on there. i've done the card deck workout a couple of times while traveling. it's fun. take a deck of cards and decide up front what exercise each suit represents. for example, hearts are burpees, spades are high knees in place (each rep is LR), clubs are push ups, and diamonds are overhead arm raises. then as you turn over cards you do the exercise of each card's suit. reps are the value of the card, face cards 10, aces 15. go through the deck as quickly as possible. hardly matters what exercises you do, those are just examples. adarq gave a bunch of others: quick feet, defensive slides, mountain climbers, etc. are all good.