While many arms exercises are biceps-focused, this simple isolation exercise dials in on the triceps, or the backs of your arms. (If you do find your biceps working overtime, this is a great way to make sure you're building balanced upper-body strength.) "By hugging your elbows in toward your body and using your own bodyweight, this area is majorly targeted," says Speir. And it's really easy to do anywhere. "The great thing about this move is it takes up the smallest amount of space," she adds.

In addition to the direct beneficial effects of exercise on the heart, regular exercise also improves several important cardiac risk factors. Exercise lowers blood pressure, helps prevent obesity, reduces triglyceride levels, increases HDL cholesterol levels, and improves insulin resistance (and thus helps to prevent or even reverse metabolic syndrome ). An exercise routine has even been shown to be helpful in achieving smoking cessation.

The skin also serves as a release point for heat. (See “Why Does My Face Turn Red When I Exercise?” for more on that.) When you exercise, your muscles generate a lot of heat, which you have to give up to the environment so your body temperature doesn’t get too high, Hackney says. The heat in the muscle transfers to the blood, which shuttles it to the skin; it can then escape into the atmosphere.
So short of moving to a blue zone, exercising for just 10 minutes a day, or 75 minutes a week, can earn you an extra 1.8 years. The findings held true even for those individuals who were overweight or obese; adding exercise helped them live longer, while being obese and inactive decreased life span by up to 7.2 years. The benefits of adding more exercise increased and then plateaued at about 300 minutes of weekly exercise (or an hour five days a week) adding an extra 4.2 years of life.
The workout below, created by Jess Sims, NASM-certified personal trainer and instructor at Classpass Live, Shadowbox, and Fhitting Room in New York City, challenges your entire body and doesn't require a single piece of equipment. "It’s a full-body, dynamic workout that includes strength, power, mobility, and cardio," Sims says. "It’s also great because it’s customizable—if you have less than 20 minutes, you can do the circuit one time, or if you have more than 20 minutes you can do it three times."
The benefits of exercise diminish within weeks after a person stops exercising. Heart strength, muscle strength, and the level of HDL cholesterol decrease, whereas blood pressure and body fat increase. Even former athletes who stop exercising do not retain measurable long-term benefits. However, people who were physically active in the past often can regain fitness faster.
Whether we’re fully conscious of it or not, we’re always looking for how to be happy. And exercise is one of the most obvious steps to take, as it’s not a coincidence that you feel better after a good workout: It’s science. A Penn State University study found that people who exercised, whether it was a mild, moderate or vigorous workout, had more pleasant feelings than those who didn’t. (1) 
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