Train sport specific movements simulating proper directional forces with the versatile Sport Vectors Tube Trainer. Ideal for most free weight lifts too; the Sport Vectors provide strength development for the entire body, and fits in a gym bag.
Sport Vectors come fully assembled and feature:

• 10' of surgical quality tubing (not just 4' like Walmart etc. brands). The longer tube allows a more consistent stretch and longer wear
• Choose: HEAVY Rubber hand grips and a nylon attachment loop or the SPH "Swim-Paddle-Handle" that allows both an open-hand pull and a closed fist grip
• Color coding for resistance level differentiation and to help prevent ultra-violet crystallization

Youtube link for tubing exercises:

Middle and long distance runners:
http://www.youtube.com/watch?v=fPT65WvazBk

Swim exercises:
http://www.youtube.com/watch?v=ENgIRfj1l4c
http://www.youtube.com/watch?v=-wucWZesNts