10 Fitness facts that you should know

There are so many unknown facts about fitness that you may not be aware about. Knowing these facts may give you motivation to stay fit and healthy. Here are the 10 surprising fitness facts:

1. A study has shown that only 13 % men are physical fit.
2. Underwater swimming is the only exercise in which you need to hold your breath.
3. You can build muscles at any age.
4. People who workout outdoors tends to lose more weight than those training inside.
5. There is no fix time or you can say best time to workout.
6. To burn 1 kg you need to burn 3500 calories.
7. Our heart size is of the same size as your fist.
8. A human body has 45 miles of nerves.
9. It is important to take proper sleep if you want to lose weight.
10. Heart is the strongest muscle in the body.