'Fitness pill' being developed :

Scientists are moving closer to developing a pill which could deliver some of the benefits of exercise - even for those who do not move a muscle.
The journal Cell reports US researchers now have two possible pills which appear able to build muscle, increase stamina and even burn fat.
In tests, mice were able to run 44% further - suggesting humans may be able to do the same without prior training.
The concept is controversial because of fears they could be misused in sport.