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"Circuit training can keep motivation levels high due to the variety of motion," says Shannon Griffiths, president and chief executive of Sunshine Fitness Resources in Boulder, Colorado. "It's also convenient and quick -- a benefit for those who can't seem to find the time to work out."
Go through this routine twice and you'll spend about 30 minutes exercising your heart, lungs, and muscles. If a 30-minute workout seems too challenging, start with 15 minutes.
a. With the ball under your mid- to upper back, hold the weights above your chest.
b. Slowly lower until your elbows are flexed at 90 degrees to your side, then raise again.