At 1 1/2 times its length, the Blue (Heavy) weight equivalence is 15 lbs.
Customer Rating: 
Summary: Spri Purple Resistance Band
Comment: I wanted some variance to my workout routine, so I purchased this itwem for $10.00. A very strong band with many exercises one can attempt. I am glad I purchased this item and would so again!
Customer Rating: Summary: THE most versatile, flexible, and portable fitness equipment ever made
Comment: Resistance Bands are THE most versatile, flexible, and portable fitness equipment ever made!
You can do any exercise, anytime, and anywhere with them. I carry my babies wherever I go.
I do them in classes, meetings, and movies.
Resistance band s is the most economical resistant equipment out there, since you can just buy a light, medium, and heavy band for all your needs. Simply combine the bands together to create different variations of intensity! Use the resistance bands with the stability ball, stability disc, and bosu balls for even greater workouts.
Just make sure you check the anchor you are wrapping the resistance band around before you do the exercise. Once, I put the resistant band on a door knob, and it slipped out and almost took out my eye. Also, check to make sure there are no tears in your resistant band. Safety first.
If you don't feel the burn after 10 repetitions, you are doing the exercise wrong. In all exercises, it is the eccentric portion of the exercise that builds muscle. Do the exercise in a smooth, controlled fashion with a 3 concentric and 6 eccentric count. Squeeze at the peak of the motion to get that extra pump.
As in all exercises, make sure to keep your wrists straight and check your posture with these seven vital points: feet hips-width apart and pointed straight ahead; knees slightly bent; pelvis at perfect middle, as if you are sitting at a bar stool; stomach tight, but not flexed; chest straight and aligned on top of ribs; shoulders parallel to ribs; and neck straight on top of body.
Customer Rating: Summary: Exellent product, glad I bought it
Comment: I bought this band with the blue and red one as a combo deal. At first I was skeptical, but I've grown to love these bands. They allow you to perform all sorts of different exercises, and they work great. Also, they don't hurt my shoulder joints like free weights tend to do at times.
I'm really pleased with these, and I'll be getting a new set as soon as I wear these ones out.
Customer Rating: Summary: Great product, super fast shipping!
Comment: I couldn't believe how fast my bands got to me - a day earlier than the earliest approximated date!
Customer Rating: Summary: Not for men who want to gain weight
Comment: I've been using a red SPRI Xertube band with P90X for about a week. I do NOT recommend this resistance band.
Here are some problems with it:
* it claims to offer resistance for the "fit" to "very fit" range. I can do 20lb bicep curls, 10 rep max. This band lets me do curls forever. If I make a loop, things improve but:
* if you use loops or shorter sections of the band, it's hard to keep track of how much you "lifted". With dumbbells, it's clear and you can track your progress.
* the handles are not cushioned or rubberized. They're simple plastic and tend to rub against my palm.
* the handles are not extensible with additional tubes. Compare that to Lifelineusa bands, where you can put up to three bands on the handle and greatly vary the resistance.
* as another reviewer mentioned, bands don't really work for muscle gain. They work for strength and toning.
Pros:
* much cheaper than dumbbels, and easy to carry around.
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