After spending about 4 months or so in the gym doing general strength training (biceps, triceps, chest, back, etc.) I've decided to go into functional training for tennis. The problem is that I've never done any such training, the most I've done is HIIT back in 2011 along with some medicine ball crunches for abs. That's it. Can anyone suggest a program/website or any other source for TENNIS specific strength training? Thanks.