StrechCordz Short Resistance Swim Training Belt Reviewed (Verdict: Works a Treat)
A Cool Tools reader gives a rousing endorsement to "StrechCordz ," a simple belt with a rubber tether that makes it possible to swim endless laps without installing an expensive wave pool.I wasn't sure I'd need the belt, frankly, since our pool is big enough for actual swimming. In practice, however, even though our pool is 32 feet long, it's not really enough to be comfortable for laps. The belt is an elegant solution. There's no more constantly calculating the strokes left till the next turn. Swimming in place allows a steady, relaxed rhythm that would otherwise be impossible. I find I can swim longer on the belt and get more of a workout. Our pool is 18 feet from side to side. The short belt (4 ft.) is plenty long enough for me, but there's a longer version for larger pools.You can pick up a StrechCordz for around $30—far cheaper than other endless swim options. (Except for my technique, which is to start at the top of the open sea, then swim down.)
StrechCordz Short Resistance Training Belt [Cool Tools]

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Way back when, when Dinosaurs roamed the Earth and I was on the high school swim team, we used to fasten lengths of rubber surgical tubing around both ankles and the starting block.
If you swam like mad for what seemed like forever (no legs, remember?), you'd eventually be able to grab ahold of the edge of the far side.
Followed shortly thereafter by being jerked backwards, skipping across the water towards the start.
I don't feel right !
Competitive swimmers use these and the longer ones for all kinds of training purposes (2 belts on one cord for a tug-o-war, etc). I never considered them as a general consumer product. Interesting...
I'd just be happy to have a pool.
when I use this product I seem to be positioned lower in the water than free swimming. any comments?