![Three referees do warm-up exercises before a match at the FIFA U-17 World Cup.](https://imagenes.elpais.com/resizer/v2/UH5WMTJUBJHAHIH7YQKVOLOJXM.jpg?auth=ac37485d49f812fd8ee618bc4f1dca03608e683c90bbb14c676b3844f66a0048&width=414&height=233&smart=true)
How to properly warm up before exercising
It is important to prepare the body for the demands it will face in a training session
It is important to prepare the body for the demands it will face in a training session
Some of popular culture’s most ingrained ideas about physical activity don’t have a scientific basis