Headers have long been associated with concussion risk, so in 2016, the U.S. Soccer Federation banned headers in athletes younger than 10 and limited the time players aged 11 to 13 could practice ...

The specific aerobic training consisted of four sets of 4 min work periods dribbling a soccer ball around a specially designed track at 90–95% of maximal heart frequency, with a 3 min recovery jog at ...