A quick note today, Markovic 2007 did a review of 26 studies of plyometrics and their effects on vertical jump height. In his analysis, it was found that plyometrics improved vertical height. Squat jumps improved it by 4.7% as did drop jumps, counter-movement jumps with arm swing by 7.5% and counter-movement jumps by 8.7%. This would suggest that if one plays basketball, football or volleyball and specifically wanted to improve their vertical jump- counter-movement jumping should be the primary exercise incorporated during that phase of training.