And research published in November 2017 in the journal NeuroImage showed that aerobic exercise may be helpful in improving memory function and maintaining brain health as we age. The study, led by researchers at Australia's National Institute of Complementary Medicine at Western Sydney University, looked at brain scans of 737 people ranging in ages from 26 to 76. The group included a mix of healthy adults, people with Alzheimer's and other cognitive impairments, and people with a clinical diagnosis of mental illness, including depression and schizophrenia. The researchers found that exercises, like riding a stationary bike, running on a treadmill, or walking, slowed down the deterioration of brain size and slowed the effect of age on brain health.
First off, it is impossible to “spot reduce”, that is to lose fat from a specific area. When you do exercises that target a specific area, you’re actually targeting the muscles (not fat!) in that area. That means you’re doing step 2, which is increasing the shape and firmness of your arms by toning your arm muscles. That will get you some results, but fighting jiggly arms requires more than just spot exercises!  
Get down on all fours with your knees placed directly below your hips and palms placed directly below your shoulders. Now, raise your right arm forward and stretch your left leg backward at the same time. Create a tension in your back by flexing your foot. Hold the position for a few seconds and then come back to the starting position. Repeat the same using your left arm and right leg. Repeat 15 to 20 times on both sides.
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