I just posted 7 great exercises using rubber tubing as your resistance. We love to use the Double Cord from Power Systems and the heavy duty bands from Lifeline USA seen below. These 2 items are very versatile and inexpensive. They can be found on amazon and most major sporting goods stores. This would be a great addition to any athletes exercise gear. Many baseball players will keep these in there bat bags and attach them to fences and or poles for warm-ups before practice and games. Enjoy!