John Cena said he's training to lift weights into his 80s and beyond. Here are 3 longevity lessons from the WWE star.

John Cena said he's training to lift weights into his 80s and beyond. Here are 3 longevity lessons from the WWE star.

After decades of body slams, John Cena is doing more yoga and taking more rest days.Andrew Timms/WWE via Getty ImagesJohn Cena said his pro wrestling career taught him how to adapt to any challenge, even aging.At 49, he's prioritizing rest days and mobility so he can still do a heavy squat when he's 85.He said his one regret from his WWE career was not seeking help sooner, especially for his health. John Cena is one of the most decorated athlete…