Improve Shoulder Motion and Spine Mobility For BJJ With One Exercise.
This is a great and effective technique to warm up your shoulders and increase motion through the spine. Very simple to do and can help get your body warmed up and ready to train.
www.jiujitsutherapist.com

These stretches and exercises are some that I have used and found beneficial and effective for improving hip flexibility which can help with rubber guard and assists with guard retention.

Initial thoughts on the Bauerfeind Sports Knee Support and Genutrain Knee Brace. These are two of the best knee braces for grappling. The feel, support, compression, and fit are important as these braces stay in place with grappling and don’t restrict movement.
Check out the braces here: http://www.shareasale.com/r.cfm?b=706061&u=1416655&m=58066&urllink=&afftrack=

To improve shoulder mobility and shoulder tightness for BJJ, these 5 stretches are quick, easy, and really effective for keeping your shoulders healthy, mobile, and to prevent injury when on the mats.
1. Lat Stretch
2. Posterior Capsule
3. Pec Stretch
4. External Rotation Stretch (great for preventing injuries from Americanas)
5. Internal Rotation Stretch (great for preventing injuries from Kimuras)

Low back pain is something most, if not all, BJJ practitioners currently deal with or have dealt with. Back pain can limit your movement, technique, and effectiveness on the mats.
This video gives you a number of stretches and other techniques that will help you maintain your flexibility, control tightness, and reduce pain.