It’s a battle that’s all too familiar to millions of people – on one side is a packet of biscuits, the sofa and a DVD, on the other a work-out at the gym.

And all too often the gym is on the losing side.

But now scientists think they may have found a way to make opting for the weights and treadmill the winner far more often – and it almost sounds too good to be true.

Scroll down to discover inspiring ways to get fit this summer...

Researchers believe that it may be possible to manufacture a pill that motivates people to exercise.

The secret, says a team from the University of Zurich in Switzerland, is a brain hormone called erythropoietin (Epo).

When this was elevated in mice, it made them run around a lot harder.

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"Here we show that Epo increases the motivation to exercise," said lead author Max Gassmann. "Most probably, Epo has a general effect on a person's mood and might be used in patients suffering from depression and related diseases."

To make this discovery, Gassmann and colleagues used three types of mice: those that received no treatment, those that were injected with human Epo, and those that were genetically modified to produce human Epo in the brain.

Compared to the mice that did not have any increase in Epo, both mouse groups harboring human Epo in the brain showed significantly higher running performance.

A report of the study appeared online in The FASEB Journal.

Its Editor-in-Chief, Gerald Weissmann, said: “If you can't put exercise in a pill, then maybe you can put the motivation to exercise in a pill instead.

“As more and more people become overweight and obese, we must attack the problem from all angles. Maybe the day will come when gyms are as easily found as fast food restaurants."

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• 10 Inspiring Ways To Think Yourself Fit

  How to 'think yourself fit' this spring by fitness trainer and coach <a href="http://www.timweeks.co.uk/" target="_hplink"><strong>Tim Weeks</strong></a>. <a href="https://twitter.com/#!/tim_weeks" target="_hplink"><strong>Follow Tim on Twitter</strong></a>

• Enjoy It

  If there is no passion in what you do, even the greatest motivation power wont get you over the first hurdle. Loving what you do makes the whole 'fitness experience' a lot of fun. Think of it like your job: hate your job and the week drags by. Love your job and nothing is ever a problem and motivation is constantly high.

• Give Yourself Plenty Of Options

  Due to your natural peaks and troughs of ones mood (especially for women due to menstrual cycle), you need to have 4 or 5 different activities to choose from depending on your mood.   If you really can't be bothered, having an easy option like a walk will mean you don't need superhero powers to motivate yourself to get off the sofa.  Try as many different activities as you can until you find a few that 'click'.

• Set Yourself A Challenge

  However cliché this sounds, it works. This doesn't necessarily mean signing up to the London marathon or climbing Everest. It might be trying to complete a lap of the park jogging without walking.

• Invest In A Decent Trainer

  Anyone can write a programme. The real talented trainers out there have something very special about them.   Look at Jose Mourhino. Love him or hate him. He has an amazing ability to motivate people and unlock peoples potential to allow them to reach new heights.  Having that 'motivator' at your side should be able to unlock that 'belief' within you that everyone has. Look for someone who is interested in your long term development. They can actually help you put all of these 10 items in this list into place.  Not just getting ready for the beach in 4 weeks time.

• Build A Fortress Around You

  'Stuff' happens in life that you have to deal with as you go along (good or bad). Build a support network of good people around you for when bad times arrive. It therefore means you don't always have to rely on will power. Having good people around you can actually kick start your motivation for you without you even realising.

• Share Your Achievements

  If you get feedback from another person, their enthusiasm can help you feel valued. If you feel good about yourself, you naturally enter a self generating positive motivation cycle.

• Have An Incentive

  This may sound ridiculous but it can work.  Put a chart on your fridge for 10 sessions.  When you have completed all 10, treat yourself. Buy an item like a handbag, a pair of shoes or a book. The physical item is a nice reminder to yourself of how amazing you are and what you have achieved.

• Have A Fitness Buddy

  Sometimes having a friend giving you a kick up the bum is really helpful. You can actually motivate each other. Especially useful if one can't be bothered.

• Don't Go Over The Top

  If you go over the top and set yourself totally unrealistic goals (eg I am going to exercise everyday) the low you feel is VERY low. You then need superhuman motivational powers to get back on track.  Don't put yourself in the position in the first place.

• Take Time Off

  If you exercise regularly, at some point you will hit a motivational lull. Therefore, when you go on holiday, enjoy yourself. Forget exercise.  It will recharge your brain so you get back that hunger.