Richard Hasse
More books by Richard Hasse…
“great leg exercise is to squat until your knee is at a 90 degree angle and then hold it for 60 seconds. Six or seven of these will really boost your leg strength without grinding away at your knees.”
― 5.0 Tennis Secrets: What You Need to Know to Play Great Tennis
― 5.0 Tennis Secrets: What You Need to Know to Play Great Tennis
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