Studies on athletes show that molecular hydrogen rich water decreases blood lactate levels which reduces muscle fatigue and thereby increases peak power output.
https://www.ncbi.nlm.nih.gov/pubmed/22520831
Studies also show that molecular hydrogen rich water resulted in a faster return to normal joint range of motion for both flexion and extension of the injured limb.
https://www.ncbi.nlm.nih.gov/pubmed/25295663
Hydrogen/oxygen mixed gas inhalation improves disease severity and dyspnea in patients with Coronavirus disease 2019 in a recent multicenter, open-label clinical trial
Molecular hydrogen: a preventive and therapeutic medical gas for various diseases.