Endorphins are hormones in the brain associated with a happy, positive feeling. A low level of endorphins is associated with depression. During exercise, plasma levels of this substance increase. This may help to ease symptoms of depression. A recent National Health and Nutrition survey found that physically active people were half as likely to be depressed.
Lie on your back with the knees bent and feet flat on the floor, approximately hip-width distance apart. Lift the left leg up so that the leg is straight and the thighs are parallel. As you exhale, keep the core engaged and lift the hips off the floor. Hold for one to two seconds, and slowly lower down to starting position. Complete 10 to 12 reps on the right side before switching to the left.

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!  
Feeling uninspired in the cubicle? The solution might be just a short walk or jog away. Research shows that workers who take time for exercise on a regular basis are more productive and have more energy than their more sedentary peers Employee self-rated productivity and objective organizational production levels: effects of worksite health interventions involving reduced work hours and physical exercise. Von Thiele Schwarz, U, Hasson, H. Department of Psychology, Stockholm University, Stockholm, Sweden. Journal of Occupational and Environmental Medicine, 2011 Aug;53(8):838-44. A randomized controlled trial of the effect of aerobic exercise training on feelings of energy and fatigue in sedentary young adults with persistent fatigue. Puetz, T.W. Flowers, S.S., O’Connor, P.J. Department of Kinesiology, University of Georgia, Athens, GA. Psychotherapy and Psychosomatics, 2008;77(3):167-74. Epub 2008 Feb 14.. While busy schedules can make it tough to squeeze in a gym session in the middle of the day, some experts believe that midday is the ideal time for a workout due to the body’s circadian rhythms.
Heart Disease and Stroke. Daily physical activity can help prevent heart disease and stroke by strengthening your heart muscle, lowering your blood pressure, raising your high-density lipoprotein (HDL) levels (good cholesterol) and lowering low-density lipoprotein (LDL) levels (bad cholesterol), improving blood flow, and increasing your heart's working capacity.
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As people enter their forties and fifties, muscle mass starts to decline because of aging and, in some cases, decreased activity levels. Muscular atrophy can also occur because of health conditions, such as joint pain. As we age, it’s important to increase or maintain muscle mass through strength training, not only because it helps burn calories, but also because muscle mass is essential for strength and balance.
In a high plank position—palms flat on the floor beneath your shoulders, arms straight. Ease down on to your left forearm. Then, ease down your right arm until you’re in a forearm plank. Now push up with your right hand and then your left to return to a high plank. Repeat, alternating which side you lower first with each rep.” Lagree recommends doing two sets of ten reps. Another workout worth trying: these 9 resistance band exercises that will work your entire body. 
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