【EXTRA】Extra Tube Training Set. Purchased for around 4500 yen. From professional surfers aiming for the world stage to weekend surfers! This training set utilizes the flexibility of the tubes to maintain a wide range of motion and soft muscles. The advantage of using rubber tubes is that you can train your muscles gently while expanding your joint range of motion. You can customize your training by changing the strength of the tubes. It can also be expected to improve stiff shoulders and lower back pain. There is no instructional DVD (I think it's unnecessary as you can find them on YouTube, etc.) Free shipping Instant purchase available First come, first served Please refrain from purchasing if you are sensitive to used items.