Serena Williams Endures 3 Minutes in -110° for Cryotherapy Session: ‘I Can Feel a Difference’ Serena Williams Endures 3 Minutes in -110° for Cryotherapy Session – Serena WIlliams is testing her limits, sharing the progress of her sessions in ultra-cold cryotherapy chambers where temperatures dip to -110°. “This was Day 2 of cryotherapy. What an experience I lasted the full …