Off Season Workouts To Increase Distance?
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Check out, Fix your Body, Fix your Swing by Joey Diovisalvi and Roger Fredrick's, Secrets of Golf Instruction and Flexibility. Joey D workouts are very similar to the ones my physical therapist gave me to do to work on core and shoulder strength and flexibility. They are easy to do and you can do them almost anywhere. You can just use inexpensive resistance bands. I do this when I travel too.
Roger Fredrick's flexibility program is also close to a PT's program. I used both of these this year to rehab my shoulder and knee issues. My iron distances leveled out about 10 yards further than last year. It also keeps you from injury. The instruction part of the book was so-so.