The differences between jogging and running are not clear-cut. In fact, the words are often used interchangeably. According to the Better Health Channel, the main difference between running and jogging is intensity. Runners sometimes jog for a while before a race or a long run to get their muscles loose.

There are more than 600 skeletal muscles in the human body. Because your glutes (buttocks) and hip muscles are skeletal muscles that are heavily engaged while running, you could experience soreness in these areas for a number of reasons.

Rapidly moving from one place to another, also known as sprinting, is an action that is required in many different sports and activities. Sprinting can be broken down into four different phases, each distinguishable from the others by comparing three different variables.

Back spasms can occur during and after running or other strenuous activities. Spasms are when the muscles in your lower back tighten up painfully. Spasms usually are the result of previous trauma, inflammation or muscular weakness in the region, according to the Sports Injury Clinic.

Whether you're an experienced runner or have only recently taken up recreational jogging, it is not uncommon to experience a pins and needles sensation in your legs while running. This uncomfortable sensation has various causes that you can usually take measures to prevent.

Running is a good way to work out the cardiovascular system and the muscles of the leg, but it is also very hard on your joints and bones. Each time your foot strikes the ground when running, it puts pressure equivalent to four to five times your body weight on your legs.

A bruise on your calf as the result of running can be disturbing, particularly if you experience other symptoms such as pain. Running-related calf bruising can be due to a variety of environmental factors and training errors.

Size is important in how athletes perform in many sports. For example, professional football players usually are large and strong, basketball players usually are tall and jockeys usually are short. Running is a component of most sports and seems to be inconsistent when it comes to measuring height against performance.

If you experience shaking or trembling after a run, you could be suffering from muscle fatigue or low blood sugar. Both of these conditions can signal danger, or even an emergency situation.

Tightness in your shins can make walking and running difficult or painful. Though tight shin muscles are not considered "shin splints," they can eventually lead to this condition. Beginner runners and those with weak leg muscles are at greater risk for muscle fatigue and subsequent cramping.

Running is not a sport reserved for the young and elite. It is a lifetime sport that allows you to continue to challenge yourself for decades. With "Senior Grand Masters"

Your stomach is a particularly active organ, ever secreting acids and hormones and churning up whatever is inside to prepare it for absorption downstream in the small intestine.