OH yuck....now it's speed training....sigh. Indicently, Nellie, you might wish to re-evaluate Agassi's strength training. It certainly didn't allow him to hit the ball any harder, though it might have helped with injury prevention, hard to say. Agassi certainly believe it helped him, though others believe that steroids were what really helped Agassi in his "fitness"....certainly, Agassi's cardiovascular training was far more crucial to his tennis success. Others, like Michael Chang, ultimately came to feel that weight lifting was detrimental to his game. It is NOT clear cut whatsoever. As to the rep range. Most protocols for producing peak power involved very low rep ranges with very high loads. Although many studies of this have also failed to produce statistically significant increases in peak power....which is not suprising.