We all know that exercise is good for us. We join gyms, start running, buy home workout DVDs, all in the quest for a fitter, slimmer, more toned body and improved health. But after a few weeks our interest wanes, we skip a session or two, life gets in the way and then we stop altogether. After a while we tell ourselves we really should do some exercise and then the cycle starts all over again. Regular, long term exercise feels like an elusive goal.

If this sounds all too familiar and you wish you could fit regular exercise into your life without it feeling like a chore, Joanne Henson, author of 'What's your excuse for not getting fit?' has some advice:

Understand that exercise doesn't have to be unpleasant

Many fitness professionals talk about workouts as if they're of no value unless they leave you gasping for air, covered in sweat and sore for the next few days. For example, Crossfit, High Intensity Interval Training (HIIT) and obstacle races like Tough Mudder - are all about how hard you can work and what you can endure. But absolutely any exercise is better than no exercise - even at a moderate level.

Also, exercise is not a punishment! If you use exercise to punish yourself for what you've eaten, you're never going to enjoy it or feel motivated to do it.

Find something you enjoy

If you love it, you'll do it. So what do you enjoy? Do you like exercising with a friend or do you need to exercise alone? Do you like being outdoors, or do you hate being cold and wet? Do you need variety or do you like the familiar? Do you like high energy activities or something more calming?

Keep trying different forms of exercise until you find something which you enjoy - how about hiking, belly dancing, martial arts, ballet, yoga, rowing, boxing, climbing, swimming? Exercise doesn't have to involve joining a gym or running. There'll be something out there which you'll find more fun, more satisfying and more motivating than what you've done before.

Ease yourself into it

If you're new to exercise, or starting again after a long period of inactivity, there's no need to go all-out straight away. Your body won't thank you for going too hard too soon, and the pain, struggle and post-workout soreness will just reinforce any belief that exercise is unpleasant.

Take it easy for the first few times - you can always work a bit harder next time, and the next time, and the time after that...

Make it a habit

What do fit people have in common? They exercise regularly and consistently. So make it your priority to establish the habit first - you can concentrate on increasing your level of fitness later. If that means getting yourself to a gym but doing only ten minutes' exercise per session for the first month, that's fine. If you get there three or four times each week, you're establishing a routine. Then you can turn your attention to improving your performance.

Don't expect a quick fix

One of the reasons people go so hard and give up so quickly is that they are looking for a quick fix, and when they don't get one, they become disillusioned. Be patient, give it some time, and remember that exercise has long term, ongoing health benefits beyond body shape.

Pick the right exercise for your goal

If you have a specific goal, and you're going to invest time and effort in exercising, make sure that time and effort is well spent. What is it you want to achieve? Be honest with yourself, and if necessary get some advice on what would be most effective. For instance, if you want to tone up your bingo wings, target that area with resistance training rather than go running.

Track your progress

One of the positives of regular exercise is experiencing improvement and progress. If you didn't see any improvement, you'd eventually get disheartened.

So track each small improvement to keep your motivation levels high. For example, if you do your usual run today, and do it fifteen seconds faster than three days ago you wouldn't be aware of this unless you had a stopwatch, or used an app on your smart phone to time your run accurately. If you knew you'd knocked off 15 seconds you'd be more likely to go out again in two days' time to try to knock another 15 seconds off.

Exercise does take time and effort, but if you find something you enjoy, establish a habit and track your progress, you'll find it will get easier to stick with it and your body will reward you. You'll look better, feel better (mentally and physically) and be better able to live a happy and active life. What once felt like a chore will feel like a pleasure.