Spring washers, sometimes called disc springs, are a subtype of washers. They lend their mechanical capabilities to the unique profile of the material: when subject to a load, the irregularities of the washer compress with a proportionate resistance to return to their predeflected shape.
You should never stretch a pulled muscle to the point of pain or you risk re-injuring it. Do not overstretch the pulled muscles. Too much stretching can retear injured muscle fibers. Gently stretching a pulled muscle may relax the surrounding muscle fibers, which may be tight in response to the injury.
When you stretch a muscle, âit goes from the middle of the muscle belly out to where the muscle and tendon meet.â In order for the stretch to reach the whole length of the muscle and into the muscle-tendon connections, Apostolopoulos recommends holding each stretch for 60 seconds.