Professional sporting teams in Australia have been doing this a decade ago. In 2012, an AFL (Australian Football) team injected 34 players with the banned peptide Thymosin Beta-4.
FWIW they were crazy fit and won their first 8 games of the season. Their captain won the highest award at the end of the season while the coach was even said to be injecting a peptide (Melanotan II) for a summer tan.
https://en.m.wikipedia.org/wiki/Essendon_Football_Club_suppl...