This is a particularly cool one. Neuroscientists used to believe the brain was the only organ incapable of growing new cells—which partly makes sense, since we need our brains to be relatively stable over time, to keep our memories intact and to keep us us. But in recent years, it’s become clear that the brain, too, can grow new neurons, in a process called neurogenesis. And what seems to spur the growth of new neurons, perhaps above other activities, is aerobic exercise. (Other things, like meditation and antidepressant medication, have also been shown to trigger brain new cell growth.) The area of the brain that seems most capable of growing new cells is the hippocampus, the seat of learning and memory. It's also the area that’s known to “shrink” in depression, and particularly in dementia—so the fact that we may have some control over its health is exciting.
Your post-work meals should be high in protein and carbohydrates and you should always eat within 2 hours of your workout. A meal like low-fat Greek yogurt with a few tablespoons of granola and fruit or a peanut butter and banana sandwich made with 1 slice of whole grain bread can help your body to recover after a workout and improve your muscle strength.
Everyone's genetics are different. Your friend may hold more body fat in their glutes and thighs, while you may hold extra body fat in your arms or in your hips. We're all different. We're all unique little snowflakes and we hold our body fat in different areas. But, no matter who you are, if you get a low enough body fat composition, we guarantee you that you're going to lose body fat everywhere including your arms.

It’s unpleasant, but it’s true — as we get older, our brains get a little... hazy. As aging and degenerative diseases like Alzheimer’s kill off brain cells, the noggin actually shrinks, losing many important brain functions in the process. While exercise and a healthy diet can’t “cure” Alzheimer’s, they can help shore up the brain against cognitive decline that begins after age 45 Exercise counteracts declining hippocampal function in aging and Alzheimer’s disease. Intlekofer KA, Cotman CW. Neurobiology of Disease. 2012 June 30.. Working out, especially between age 25 and 45, boosts the chemicals in the brain that support and prevent degeneration of the hippocampus, an important part of the brain for memory and learning.
Another way lunges differ from traditional squats is that they train each leg individually. This is known as unilateral training. Rather than solely improving your strength, unilateral exercises increase your balance and coordination. This brings your core and back strength into play. Focusing on one leg at a time with lunges can even help with symmetry and muscular imbalances.
Before we look at what we can do for reducing arm fat, let’s be sure to understand the most common misconception about weight loss that is still floating around out there: spot-reducing. Science says you can’t spot reduce body fat. That means you can’t pick a spot on your body and exercise the fat away. You see, you store fat cells all over your body. Where your fat cells happen to be more concentrated is often a genetic predisposition. Having more fat on your arms doesn’t mean you can lose the fat directly from your arms alone. It means you have to first lose body fat all over, and then work on specifically strengthening your arms to tone them the way you wish.
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.
Bend your knees and push your butt back toward your heels, and then explode from that position back to a high plank and immediately bend your elbows and bring your chest toward the ground to do a push-up. As you bend your elbows and lower toward the ground, your elbows should be at about a 45-degree angle to your body (though you can make adjustments based on what feels best for your shoulders).
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!  

I’m on Day 21 of this challenge, and I haven’t missed a single day! This is the first time I’ve ever been able to stick to a workout challenge for more than 5 days, and I want to thank you, Cassey. You are inspirational and so fun and you understand beginners better than any other fitness instructor out there. Thank you thank you THANK YOU for this challenge, and never stop!!!
Studies have consistently shown that physical activity can help treat depression, and on the flipside, that low activity levels are a big risk factor for it. The antidepressant effect of exercise seems to be moderated in part through serotonin, the brain chemical that’s targeted with some antidepressants, and in part through bone-derived neurotrophic factor (BDNF). And this goes back to the generation of new cells mentioned earlier—exercise, though various mechanisms, seems to make the brain more plastic and more capable of growing new cells.

While a Bulgarian split squat isn't technically a zero-equipment move, they can still be done pretty much anytime, anywhere. "It activates many muscle groups and can be performed with any lifted surface, like a couch, bench, small table, or even an airport chair," says DiDomenico. The move is a major lower-body burner—you'll feel it in your quads, glutes, inner thighs, hamstrings, and even your calves.
If you cannot hold the starting position, modify it by dropping to your knees, keeping your arms and shoulders straight. Keep your head in alignment with your back and lower your chest towards the floor. Your elbows should be tucked into your sides as you hover over your fingertips. It’s completely fine if you can only lower your body a few inches. The more often you do tricep push ups, the easier they become.
I started the sleek arm challenge and super excited. I’ve injured my knee badly and it can’t take any weight at the moment sooo I figured it’s time to build some strength in my arms and shoulders. I noticed a lot of comments regarding arm fat, I have excess fat on my arms so I’ll post at the end of the month and tell you guys if there was any changes. I’m doing the exercises in the morning and evening (day 2 of the challenge and it really does take just a couple of minutes each time, 3 sets each time since I can’t do any other form of exercise at the moment). I definitely feel something in my shoulder blades and my shoulders/back feel more open as opposed to hunched (Yaaay :) )
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.
This one is obvious, right? Everyone knows things with a high sugar content (yes, sodas, cakes and pastries, we’re looking at you) is bad for health. Sugar on its own is not bad at all but in order to lose flabby arms, one has to cut down food with excessive sugar content. In order to reducing arm fat, make changes to your daily diet to cut back on added sugar. For example, reduce the amount of sugar you add to your cup of coffee or tea, instead of buying canned or bottled juices, make your own fresh fruit juice, instead of sugar loaded breakfast cereals, try porridge of oats and add some fresh fruit for a dash of sweetness.  
Because exercise helps use up oxygen, it causes your body to burn stored fat and helps you maintain a normal weight. For instance, if you walk 4 miles a day four times a week, you can burn about 1,600 calories or nearly half a pound a week. If you don't change your diet at all and keep walking the same distance over six months, you'll lose 12 pounds. Walk the same distance for a year and you'll drop 24 pounds.
“Inactivity is associated with increased risk for a number of cancers, including colon and breast cancer,” McCleary says. “Exercise has been linked with a decreased risk of developing cancer, death from cancer, and recurrence of certain cancers.” The suggested mechanisms at play include exercise’s beneficial effects on the immune and surveillance systems that detect and kill cancer cells, improved cardio-respiratory status, improved hormonal profiles, weight maintenance, and other beneficial metabolic effects, he says.
Feeling down on yourself? Exercising can help you feel better about yourself ­— no matter what type of workout you do or how fit you are. One study found that “the simple act of exercise and not fitness itself can convince you that you look better.” (10) With so much emphasis on our outward appearances in society today, it’s comforting to know that one of the benefits of exercise helps people feel better about themselves and how they look naturally.
I’m on Day 21 of this challenge, and I haven’t missed a single day! This is the first time I’ve ever been able to stick to a workout challenge for more than 5 days, and I want to thank you, Cassey. You are inspirational and so fun and you understand beginners better than any other fitness instructor out there. Thank you thank you THANK YOU for this challenge, and never stop!!!
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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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