Fitness

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    The formula for men is 220 minus age. For example, for men age 50, this gives a maximum heartbeat of 170.
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    A weighted vest is a vest you put on that has small weights that can be added to provide extra resistance for body weight exercises like pushups, pull ups, dips, and abdominal exercises. A vest also adds resistance for walking, hiking, and sprints. They are not advised for long distance running as the added weight can make running to high impact and can cause an excessive wear and tear on the body. 
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    Lifters with heart disease and blood pressure problems should exercise caution when wearing a tight belt for long periods of time because it can elevate blood pressure.  Constantly wearing a belt can also cause decreased strength development in abdominal muscles because your spinal extensors are not required to work as hard to stabilize the body.
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    The original concept of a weight belt was to be used as a protective measure for the body when lifting extremely heavy weights.  They are designed to protect your back from hyper extending by pushing in your core muscles and allowing them to work efficiently throughout a movement.  This idea has been under constant scrutiny as some experts suggest that weight belts only work when lifting with faulty mechanics and may actually allow for the muscles of the core to become weaker becasue they are not needed to work as hard to stabilize the spine.
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    Research has shown that mouth guards definitely help prevent fractured jaws and teeth, severe cuts to the cheek and tongue, and traumatic damage to the roots and bone that hold teeth in place. Mouth guards are designed to help cushion the mouth, teeth and jaw, preventing significant damage where sports injuries are most prevalent. While mouth guards are not required equipment in many sports, wearing one is an important precaution for athletes of any age and ability.
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    When roller skating or roller blading besides a helmet you can utilize wrist guards, and knee pads to help further reduce the risk of injury.  Wrist guards will protect against a broken wrist or arm if you fall, and knee pads will help prevent skinned or damaged knees.
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    Exercise accessories are one way to make exercise fun. While they are not necessary, they can enhance your workout by adding comfort. Useful accessories for working out include some form of a music device such as an MP3 player and an arm band to hold your music device. Listening to your favorite music can help you focus during a training session as well as provide you with additional motivation. You can also bring a pair of workout gloves and use them when training with steel dumbbells or barbells to avoid calloused hands. A water bottle will ensure that you stay hydrated. As a sanitary precaution, it is often a common courtesy to bring a workout towel to the gym, and some gyms will require this.

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    Color tinted lenses can help make certain colors "pop" by heightening the color of the ball or playing object against the sky or playing surface. Sport companies such as Nike have specialty lenses and complete descriptions of recommended use.
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    According to experts, if you've never injured your back, wearing a belt adds no safety.  He continues to say that if you were to get injured while wearing a belt, the injury is often more severe than had you not been wearing the belt.  Weight belts are most effective when lifting with bad technique as they serve as a physical and psychological reminder of proper technique and to use proper core stabilization when lifting.
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    For outdoor sports, definitely look for a polarized lens. These lenses reduce glare so athletes can see the ball and their environment better. If you play under stadium lighting, lenses with an anti-reflective coating may also be beneficial.