I’m a 63-year-old marathon runner — here’s the exact strength workout I use to maintain balance and build functional strength

A senior man in exercise kit.

Craig Cooper is proof that age really is just a number. At 63, he’s written a book, runs two health companies and is training for an ultramarathon. His secret? There isn’t one.

“The real key is consistency and moderation over a lifetime. You don’t need to be an ultra-athlete, a CrossFitter, or on the treadmill at Equinox every day. Nobody in the Blue Zones lives like that — and they outlive 99% of us,” he tells Tom’s Guide.