Pain in the back of the knee when straightening the leg is called posterior knee pain. Finding the cause can be difficult as it can come from problems with the bones, muscles, tendons, ligaments ...

Stiff legs make for faster sprinting, as John Shepherd explains ...

Ankylosing spondylitis (AS) is a type of arthritis that causes inflammation in the spine. Over time, the ligaments and joints of the spine become stiff, and in severe cases, the bones fuse together.

Stiff Legs, Compliant Arteries: How Marathon Training Helps the Heart. New research showed a 17-week running program lowered the arterial age of subjects by 4 years. Some aren’t convinced. By Michael ...

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Human legs adjust stiffness during fast hopping by shortening key calf muscle fibers, a process termed "negative stiffness." This counterintuitive behavior enhances leg stiffness, ...

A 60-year-old white woman presented to a rheumatology clinic with a chief complaint of increasing stiffness and skin thickening in her arms and legs, which had started 3 months before her ...

How to Do Stiff-Leg Bounds Alternate Leg Fast Leg. View full post on Instagram Stand tall with your hands at your sides. Without bending your right knee, take a step forward with your left foot.

Kuriyama, K., & Takeshita, D. (2025) Leg stiffness adjustment during hopping by dynamic interaction between the muscle and tendon of the medial gastrocnemius. Journal of Applied Physiology . doi ...