Just because a technique is old, doesn't make it ineffective.
How physically prepared is your kid to play in a season that doesn't end for ten or more years?
Years ago I used the kettlebell swing to improve jumping ability. I didn't know why it worked at the time, but new research looks into the relationship between the swing and explosive strength.
Recent research compared agility, body composition, power, and strength of NCAA Division-I (D-I) and Division-III (D-III) female athletes.