When a muscle contracts, it shortens. Take the biceps for example. Without getting too technical, the biceps are attached at the forearm and shoulder. When your biceps contract, they shorten and bring those two points closer together. When you rest, the muscle returns to its normal length, and the two points move farther away. Constantly contracting your biceps over a long period of time would cause them to get shorter, even at rest.
How to do it: Put a 20- to 36-inch box behind you. With your feet hip-width apart, lift your leg and place the instep of your rear foot on the bench. Lower your hips toward the floor so your rear knee comes close to the floor, keeping your back straight. As you descend, make sure you don’t bend the torso excessively forward and your front knee does not pass your front toes. Pause when your rear knee is close to the floor and your front quad is parallel with the floor, then drive through your front heel to return to the start position. Repeat this movement, alternating sides each time.
If you've been working out hard, playing football or other sports, or moving a lot of heavy furniture and are suddenly suffering with radiating lower back pain, chances are you have pulled muscles or strained muscles in the back. Often, strained muscles will cause a burning sensation in the lower back a feeling of having limited movement ability. Doctors prefer to limit prescribing of opiate pain medications and may give you an alternative medication with less risk of becoming dependent.
We all know the nursery rhyme about the hip bone being connected to the leg bone. It’s a simple song, but it contains a surprising amount of truth. The fact is that the body’s muscular, nervous, and skeletal systems truly are complex and intricately interconnected. Even a daily task such as walking down the street uses a complete network of a body’s muscles and bones, all of them reliant on each other. And when a strain, tear, or other injury happens in one part of your body, pain can often present itself in an entirely different part of your body.
You're more likely to get a hip flexor injury if you've had one in the past, you don't warm up properly before engaging in athletic activity, your muscles are already tight or stiff, or your muscles are weak from being overused. If, while exercising, you try to do too much at once in too short an amount of time, you can also put yourself at risk for a hip flexor injury.