Exercise

Circuits

How quickly will it make a difference? After two weeks of twice-weekly circuits.

How many calories does it burn? 476 per hour.

Will it keep me motivated? Circuit training is as challenging (or not) as you make it. You are unlikely to get bored as circuits can constantly change their content and order.

Specific benefits A good circuit addresses every element of fitness - aerobic, strength, balance and flexibility. Ideally, an instructor should introduce new tools - medicine balls, skipping ropes, weights, wobble boards - to make sure you are always developing new skills and testing different muscles.

Risk factors Because the movements are so varied, there are very few risks - unless you perform exercises with poor technique.

http://www.guardian.co.uk/lifeandstyle/2007/mar/06/healthandwellbeing.health