It always makes me wonder why some tennis players' performances drop off so significantly in their mid sometimes early 20s. I have grown up a fan of many sports and I've witnessed Michael Jordan at his best at age 28-29 and even dominating in his early 30s. I've seen great track athletes such as Michael Johnson, Donovan Bailey, and Carl Lewis break world records into their late 20s and even early 30s. I've seen Jerry Rice play top-notch football well into his 40s. And even this year we saw Steve Nash win the NBA MVP award in his early 30s. Now Agassi has proven a tennis player can succeed in his late 20s and early 30s. My question is this: why can't anybody duplicate his success? Some may say it's because of the long grind of the tennis season. I personally think that's a cop out. Top players are in a position to pick and choose what tournaments they want to play and I've even seen guys like Lleyton Hewitt take 3-4 months off at a time in thie middle of the season just to "rest." I think much of it lies in strength training. Now we all know that most of the players these days do lift weights. However Agassi is the one guy on tour that I can think of that seems to approach weight training much like a football or basketball player would....really pushing himself physically trying to improve. It's proven that much of the aging of an athlete's body is due to muscle loss. Weight training is the one thing we can do to maintain our muscle mass. In fact, weight training can actually add muscle mass so in a sense it can reverse the aging process.