The Body You'll Need
We have made fitness almost entirely about appearance. The gym, the diet plan, the before-and-after photo—all of it is calibrated toward a single question: how do I look? We chase a version of our body that performs well in photographs and measure our progress in mirrors and waistbands. This isn't entirely wrong, but it is a remarkably short-sighted way to invest in the only machine you will ever own. The body you are building today isn't just for this decade. It is the one that will determine whether, at eighty, you can get up off the floor without help, carry your groceries without pain, or keep up with a grandchild without running out of breath before they do.
The fitness industry doesn't sell this version of the story because it doesn't photograph well. There is no dramatic before-and-after for "maintained autonomy at seventy-five." But the research is unambiguous: VO2Max—your body's maximum capacity to use oxygen during effort—is the single strongest predictor of longevity and quality of life. Not your weight. Not your body fat percentage. Not the number on your waistband. The question the data is asking is simple: how capable is your cardiovascular system, and how much reserve does it have? The uncomfortable answer is that most people in their forties are already losing ground, quietly, without noticing—because the metric they've been tracking was never the right one.
Functional strength tells the same story. The ability to carry something heavy, to get up from the floor under your own power, to stabilize a joint when the ground shifts unexpectedly—these are not gym achievements. They are life achievements. Grip strength is one of the strongest predictors of all-cause mortality in middle-aged adults, not because gripping things is inherently important, but because it is a proxy for the overall structural integrity of the system. It's a principle we learned the hard way in Is Running for 100 Days Straight Incredibly Stupid or a Good Idea?—VO2Max went up five points over 100 days, but by day 90, a pickle jar had become impossible to open.
A body that works is a body that lasts. And a body that lasts is the difference between being an asset to the people you love and being a burden to them. It's a shift we explored in Why People Quit CrossFit—the ones who got the most from their training were the ones who measured success in decades, not sessions.
This is the shift that changes how you train. When you are building for appearance, every missed session is a cosmetic setback. When you are building for function, every session is a deposit into a long-term account that pays out in decades, not weeks. You stop chasing the motivation that comes from wanting to look different, and you start operating from the quieter, more durable motivation of wanting to be capable. The punch-the-clock approach—showing up consistently, doing the necessary work, then closing the loop—becomes not just practical but logical. You aren't trying to impress anyone. You are maintaining a machine that has a long way left to run.
So, stop training for the version of yourself that looks good in a photograph. Start training for the version that can still carry the groceries, climb the stairs, and get up off the floor at eighty. The body doesn't care about your aesthetic goals—it responds to the demands you place on it. Place the right ones.
Until next time,
Scott and Lennart
If this resonated, you'll want to read Longevity Metrics — it breaks down exactly which numbers are worth tracking as you age.