Hot Ice in Floyd Mayweather's Secret Weapon for Pacquiao Match

Floyd Mayweather will do anything to beat Manny Pacquiao ... even subject himself to -220 degree nitrogen gas during Cryotherapy sessions ... intended to heal his body. TMZ Sports spoke to David Levi ... owner of SubZero Recovery in Vegas ... who says Floyd makes daily ... and sometimes nightly ... trips to his business for the insanely cold therapy. The Cryo sessions last 90 seconds to 3 minutes ... and according to Levi, it helps to enrich blood, expel toxins and also does a bunch of other cool stuff.