Basic Knowledge
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Beginner Running? Just Keep Your Mouth Shut!
Many people ask when they start running: "How fast should I go?" or "What should my heart rate be?" Actually, if you’re…
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Plantar fasciitis
The plantar fascia is a ligament stretching from the heel to the forefoot, supporting the arch and absorbing impact dur…
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Overtraining syndrome (fatigue, poor sleep, performance decline)
Overtraining syndrome is not caused by a single event, but by long‑term training volume or intensity exceeding the body…
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Piriformis syndrome (similar to sciatica)
The piriformis muscle lies deep in the buttock, helping hip external rotation and pelvic stability. The sciatic nerve p…
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Hip flexor strain
The hip flexor muscles (mainly including the iliopsoas) are responsible for lifting the thigh forward, playing a key ro…
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Black toenail
A common runner’s issue, “black toenail,” is usually caused by bleeding under the nail. During long runs, if the toe bo…
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