If you play serious racquetball you need serious strength training. Back in the day I was told never to weight train for racquetball. Believe it or not that was the thinking in the early 70s by many people. I knew that was wrong so I enrolled in our local Nautilus club and began weight training. Basic weight training consists of-warmup on a bike, treadmill, elliptical or some such five to 8 minute repetitive exercise.
Then you go largest muscle groups to smallest in an ideal “push pull” pattern. Example-Leg Press(Push large muscle) Hamstring curl (pull) lunge squat-push and pull-calf raise-push, Lat pull down-pull, shoulder incline press-push, row-pull, triceps press down(push) to biceps curl(pull) followed by stomach curls(pull) and back extensions(push)
Basic strength training is not sport specific. Think of the movement in racquetball and what training your body needs. Shoulders, arms, legs. and core all need work and rotational work too! We rotate to hit forehands and backhands so I always suggest to my athletes they hire a personal trainer. I have a phys ed minor and have had basic courses in physiology, etc. but I am a racquetball expert, not a training expert.
A professional trainer is always best. A good trainer will also periodize your training, which means your training is cycling so you peak at the most important tournaments of the year. A good trainer knows when to push you hard and when to back off the training too. That is really important if you play tournaments!