In CBT play, a parachute is a cone of leather or rubber that buckles around the scrotum. The wide end hangs down and takes clips or weights. The load spreads around the sack instead of pinching one fold of skin.

Fit at the top cuff is everything. Too tight and you lose color in the testicles. Too loose and the cone slips off when you add mass. Leather needs an occasional condition so it does not dry into a blade. Rubber needs powder and a check for cracks at the stitch line.

Add weight standing. Walking will multiply the swing. Short sessions tell you more than a heroic hour. Keep a towel on the floor if you use metal plates; dropped steel on a toe ends the scene.

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• Use multiple small weights rather than one awkward brick.
• Check color and temperature every few minutes at first.
• Do not combine with a humbler until each piece is familiar alone.
• Unlock hardware before swelling peaks.