Tether - Attached to a belt and then to a ladder or some other fixed point at poolside, a tether helps you turn a too-small pool into a swimmer's treadmill.
6) Tethered Pool Sprints: I live in Phoenix and hot weather is fast approaching. It often becomes tedious to get out there for sprints when the temperature is well over 100 degrees.
Step onto deck of treadmill and grasp rails. Straddle belt by standing on sides of treadmill. Attach safety tether. Select "quick start" or enter program.
Execution ...
88 was found between the number of shuttles completed during the MSST and VO2max measured during an incremental tethered swim test to exhaustion. A stepwise multiple regression revealed that VO2max accounted for approximately 78% of the MSST variance.
 See also: Fitness, Exercise, Intensity, Endurance, Back
  
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