The Sunday Times reported recently that at least five professional soccer players in England have had stem cells from the blood of their children's umbilical cords frozen. It's being done to protect their progeny in the event of future illness, but is also seen by some of the athletes as a potential aid to fix their own damaged cartilage and ligaments in the future.
One unidentified Premier League player told the British newspaper: "As a footballer, if you're prone to injury it can mean the end of your career, so having your stem cells — a repair kit, if you like — on hand makes sense."