Want to be productive and energetic? You need to keep your body in peak fighting shape. You don't have to be a gym rat though, and really you don't even need a gym. There's plenty you can do whether you're at home or traveling. Motivation can be particularly challenging when on the road. Your schedule is messed up and maybe you're staying at a hotel without a gym (or worse, staying at a hotel with a tempting minibar). But that's no excuse, according to Kirk Myers, the founder of New York's exclusive DogPound gym, where everyone from Hugh Jackman to Victoria's Secret angels get whipped into shape. He says there's always a few exercises or combination of bodyweight moves that can spike your heart rate in a matter of minutes and get the job done. Herewith, just a few.