To improve cardiorespiratory fitness, a person should: participate in anaerobic exercises of moderate intensity for 30 minutes t
hree to four times a week participate in anaerobic exercise of moderate intensity for 90 minutes six to seven times a week participate in aerobic exercise of moderate intensity for 30 minutes three to four times a week participate in aerobic exercise of moderate intensity for 90 minutes six to seven times a week
They still do so because the coaches and parents have taught their kids how to be safe during the games. There are also rules such as no pushing too hard and no tripping people, or you get a yellow or red card.
