He also offers some sage advice for staying active into your eighth decade

Quick, imagine a 75-year-old man. What do you imagine him doing? Do you imagine him doing pull-ups or straight leg raises? Deep sea spear-fishing, fending off sharks in the process? Did you envision him fighting with knives, racing motorcycles, or ice climbing? No? Then you must not have pictured Scott Glenn. Because he still does all of those things. (Well, fine, not the ice climbing, but only because his doctor told him he couldn’t.)

His relentless adventuring helps explain why he still looks like he does at his advanced age. So consider this a helpful bit of motivation for anyone who’s already 75—or, you know, plans on getting there one day. Glenn, for his part, is still hoping to do more. “If I’m still a beginning student by the time they throw dirt in my face, so what?” he says. “At least I’ve had the fun doing it.”

In this video, he tells us about his workout routine and takes us through some of the martial arts he does with a very large, very sharp knife. “You don’t want to do it too fast,” he says, “because what I’m holding is potentially lethal.”