So how do you do it? Well, it doesn't have to be all grim and irksome. I mean, people have this view of fitness er, freaks you know, who sort of are jogging grim-faced round the park you know, or who are, er, working weights, doing all sort of horrible exercises you know. PT, very grim indeed. It doesn't have to be like that.

To keep yourself fit, or get yourself fitter, which is really what it's about, you just have to do a little bit more each day, erm or even every other day for that matter.

By a little bit more, I mean, erm, for instance, just walking a bit more often, a bit further, perhaps getting off the bus a stop or two sooner. Erm, perhaps, er, doing a bit of, a bit of cycling instead of travelling by public transport.

Using the stairs instead of going up in the lift. It's surprising the number of people that erm I see on the London tube who actually standing on the escalators going down you know, just standing there slowly going down, and the same with lifts.

People who take the lift down I mean, that's ridiculous. You should at least walk down, but preferably walk up, because by walking upstairs, you actually perform really quite a useful aerobic exercise, that's an exercise that develops stamina, and that's having a beneficial effect on your whole body, toning you up and helping to protect against heart disease.

So it isn't necessary to play squash three times a week or go swimming three times a week? It isn't necessary, er, actually swimming is a rather good way of keeping fit because it's particularly excellent for erm all three of the S-Factors if you like, the strength, the suppleness and the stamina.

It helps to develop all three of those rather well, er, it's also a very pleasant and relaxing way to keep yourself in shape. Three times a week would be just about right actually, or even twice a week, or even once a week.

Erm, squash though is not a good way to get fit. You have to actually get fit to play squash. Squash is a very demanding game. A very very energetic game, in fact you could do yourself a lot of damage by playing squash if you're not in good physical shape to start with.

I have a lot of friends who plays sport, and they always seem to have bad backs and pulled tendons, so what would you say to them?