Yes, you can hit peak fitness after 40. Here’s how to do it without injury

But you need to introduce impact gradually. For example, if you’ve never run and decide to tackle a half-marathon, it might take you twice as long to prepare in your 40s as it would have in your 20s.

Build a foundation

Whether you’re a former collegiate athlete who has taken a couple of decades off or 50-year-old novice inspired to run a 5K, you need to begin by building a foundation.

“If you start to incorporate explosive movements, like jumps and sprints, before you have solid muscle strength and stability, you’re going to get injured,” says Amy Schultz, a co-founder of Contra Sports Club, a gym in Los Angeles.

In general, the longer it has been since you trained, the longer it takes to build back a base. Plan to work out at least three days a week with two active rest days for three to six months, she says. Focus on cardiovascular endurance, building muscle mass and stability in your core, hips and shoulders. Aim to increase your level of effort slowly – 5 per cent to 10 per cent each month.

Once you have a foundation of strength and stability, you can begin to introduce sports-specific training that includes explosive movements, heavier weights and more intensity.

Former athletes will undoubtedly progress faster because of muscle memory, which allows them to recall specific motor skills, like swinging a golf club or popping up on a surfboard. Those skills usually return a few weeks after you start using them again, Schultz says.

Balance intensity and recovery

Going all-out every workout might have been fine in university, but it probably won’t lead to gains in your 40s. It takes more time to recover from exercise as you age. Recovery is important during the base-building phase, but you’ll need even more of it when you amp up the intensity.

This doesn’t necessarily mean more days off. Each sport has its own demands, but in general, you should cushion your hard training days more as you get older. After sprinting intervals on the track or lifting to the point of failure, say, plan for three moderate training days and one light day, says Mathias Sorensen, an exercise physiologist.

Recovery days might include light yoga or low-intensity cardio. A golfer might work on rotational exercises or spinal mobility.

No matter your age, those hard workouts should change every few months. Lifting the same weight for weeks on end can lead to a workout plateau. You can mix up the number of repetitions, the load or the amount of rest between exercises, Schultz says. If you need guidance, a personal trainer can help you develop a plan.

Don’t forget the small stuff

As you age, warm-ups, cool-downs and a healthy diet become more important, Tanaka says. Activities such as foam-rolling and mobility work are often more useful, too.

Loading

You also may need to increase your protein intake to repair and rebuild muscle, Schultz says. It’s also important for older exercisers to eat well and limit alcohol consumption, which experts say could be particularly problematic for fitness. Consider working with a nutritionist and talking to your doctor about supplements to support joint health and bone density.

Sleep is another a critical part of the performance puzzle. If you have to choose between a full night’s rest or a workout, prioritise the sleep.

“You can train and eat perfectly, but you won’t reach peak fitness if your sleep quality isn’t an eight out of 10,” Sorensen says. “This is when our body recovers.”

The New York Times

Make the most of your health, relationships, fitness and nutrition with our Live Well newsletter. Get it in your inbox every Monday.