Working out is No. 3 on the list of most popular daily activities in America, behind not working out and teaching dogs to swear. Spend your time wisely with today's Groupon: for $44, you get a three-month online membership to CoreConditioningTraining.com (a $119.85 value).

CoreConditioningTraining.com lets busy exercisers summon a vast array of 20-minute workout videos to their fingertips. Members can log in at any time to browse meal plans, tap into online personal training support, and chat with other participants to share workout tips or compare tough-face emoticons. CoreCampers can awake each morning to a new low-impact or advanced workout of the day or page through the exercise library for archived routines. Experienced personal trainers may pull in moves from strength, interval, and resistance training, all of which require only an exercise mat or towel, a set of light weights, a medium-resistance exercise band, and an understanding that no matter how much progress you're making, the trainer still can't give you a high-five from inside the computer.