But again, it's not so clear how much we need. The usual recommendations are 150 minutes/week of moderate activity, but as mentioned, that part is still up for debate. Some research suggests we need more than this to reap the benefits, while other suggests that every little bit helps. “Most research shows there is no lower threshold for health benefits,” says Paluch, “meaning that some activity is better than none and even small increases in activity will bring substantial benefits. Physical activity has the fantastic ability to act through multiple physiologic pathways in the body, making it a great bang for your buck.”
Stand with your feet hip-width apart and your arms at your sides. Lunge forward with your left leg so your right knee is nearly touching the floor and your left thigh is parallel to the floor. Bending forward, try to touch the floor on either side of your left foot (A). Push off your left foot; using that momentum, shift your weight to your right foot and swing your left leg behind you. As you sink backward into a lunge, rotate your torso 45 degrees to the right (B). Return to standing. That's one rep. Do 12 to 15 and repeat on the other side. That's one set. Do three, resting for 30 seconds between sets.
Exercise has long been correlated with a longer life, but it’s only recently started to become clear why this might be. Studies, like a new one in the journal Preventive Medicine which found that exercise is linked to longer caps at the ends of chromosomes, have helped flesh this out a bit more. These caps, called telomeres, naturally shorten as we age, with each cell division. People who live a long time have telomeres that are in better shape than those who don’t—but there’s a lot we can do to affect the rate at which they shorten over the years. The team behind the new study looked at data from CDC's National Health and Nutrition Examination Survey, and found that for people who exercised regularly, their telomeres were 140 base pairs longer on average than sedentary people's. Which correlates to being years “younger” than their sedentary peers.