I am 185lbs and in decent shape.  When we started water aerobics class,  I was really pushing hard with the flat side creating more resistence.  By the end of class my shoulder and arms were burning.   Having to hold these under the water is difficult, which is a good thing in this case.   All around a great workout using this product.

Im a big stong guy so natuarally i need some good resistance.  These did not fit the bill for me.  The wife is loving them now.  Overall, pretty good if youre a smaller build person looking for a little resistance.

Purchased DeltaBells for myself to use in my water aerobic class because I needed more resistance-these produce more resistance than the round dumbells which I have been using for quite awhile-I really like them

Since we fought over who was going to use these when we were both in the pool; I bought the second pair. They are great for excercising not only as weights, but to tuck one under each armpit and use as a float while you run, kick, etc...better than any floppy foam noodle!

Very well made, fat better than the equipment supplied by the gym.  Comfortable grips.  I hoped it provided more resistance or that there was a way to increase resistance.  I can tell they will not challenge me for long.

Provide a  good aerobic workout!