Halle's trainer

Couch potatoes

"Don't jump in at the deep end and try to change everything at once. About 90 per cent of new fitness regimes fail within the first six weeks because people attempt to lose weight, give up smoking, stop drinking and start exercising all at once. It's far too much - you just won't be able to function as a person. Go to the gym or do something active that interests you, then later make a few nutritional changes by cutting down on things rather than eliminating them."

Weekenders

"Change your programme every four weeks to keep motivated and shock your body, so it gets fitter and burns more energy. Go to the gym for four weeks, then do classes for four weeks, then try a sport like tennis, then activities - hiking, bike riding, rowing. There are a lot of health benefits of exercise - more energy, prolonged life, preventing ageing and heart disease - but you have to keep at it."

Fanatics

"Incorporate rest periods into your fitness plan. A lot of fanatical exercisers forget to rest, and run the risk of overtraining - symptoms include Chronic Fatigue Syndrome, bad breath, clogged skin and hair loss. Geri incorporates a threeday rest cycle into her fitness programme every few weeks and on those days she doesn't do anything - no little bits of swimming, cycling or yoga. Rest helps repair your natural immune system and maintain motivation."