Using the hips and core muscles is a key element to swimming faster and more efficiently
Ball bearing within the capsule creates an audible sound when tipped from side to side
Avoid swimming flat and learn to swim with strong hip rotation and undulation
Hear and feel the stroke rhythm and roll evenly from side to side
Provides swimmers instant feedback on stroke timing

Technical Details

Product Details

Product Dimensions

Package Dimensions
Width : 8.6 inch
Height : 3.1 inch
Length : 9.6 inch

Item Weight: 14.08 ounce (View shipping rates and policies)
Shipping Weight: 15.2 ounce (View shipping rates and policies)

ASIN : B001GQ2BPE