I’ve Got a Question:
I was very curious. This is a picture of what it looks like. Do they break easily as well??
http://www.ecodayspa.com/yoga/images/resistance%20tubes%20with%20white%20background2.jpg
http://static.howstuffworks.com/gif/biceps-exercises-23.jpg
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Each tube should be rated by the manufacturer for tension. My recommendation is not to buy the tubes in the pictures you provided.
Here’s a very good resistance tubes review site that discusses several popular brands.
i have had the light resistance bands snap at the handle but it’s probably because i stretched them too far(i have a door attachment for them so i can really pull them a long way)
and the heavy duty ones. no way are they going to break unless someone is superman.
i really like to workout with them(the door attachment strap i have makes them much more versatile) and they are perfect to take if you travel.