“Push-ups are a great exercise that can be done regressively or progressively. Adding things like shoulder taps, mountain climbers, or even negatives are great ways to add more effectiveness to push-ups done without weight,” explained Septh. Similarly, Barajas mentioned a change simple as switching up your hand placements (wide, narrow, etc.) will work different parts of the muscles.

You'll also build muscle to fill out your arms and firm them up. “Generally, when people are complaining about underarm jiggle, they’re usually referring to the area that is governed by the tricep,” says Williams. “If the jiggle or looseness in that part of your arm is due to a lack of muscle, then strengthening and building muscle in your tricep will also create some change in the aesthetic of that area.” She recommends performing triceps push-ups, extensions, and dips to hone in on that area and add some muscular definition to your arms.
Exercise reduces risks for serious illness. Exercise reduces people's chances of developing and dying of illnesses such as heart disease. It does this by lowering illness risk factors such as triglyceride and overall cholesterol levels, while improving the level of HDL (the "good" cholesterol which is thought to reduce the risk of heart disease). Weight-bearing exercise and strength training activities help to maintain or increase bone mass, reducing a person's risk for osteoarthritis and associated bone fractures. Regular exercise also lowers resting blood pressure rates for hours after an exercise session is over. In addition, moderate exercise may significantly reduce the risk of developing type II diabetes. Arthritics who exercise often experience more strength and flexibility in their affected joints as well as a reduced pain levels. Furthermore, exercise may delay or prevent the development of arthritis in other joints. Regular walking of over a mile a day has been shown to reduce the risk of stroke significantly. Exercise even appears to reduce the risk of developing some cancers, especially cancers of the breast and colon.
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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