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How about running spikes? Short nails?
Long nails are used on soft runways such as cinder or loess, short nails are used on plastic runways, tower nails in short nails are suitable for soft plastics, and sharp nails in short nails are suitable for sprinting on relatively hard runways. Tower nails, commonly known as jumping nails, long jump, triple jump and high jump, have good elasticity. Pointed nails are very tiring because of their high friction and good grip, and are generally used on hard runways.

Sharp nails are used in the 200-meter dash on the plastic track, and tower nails are just fine for the triple jump.

Wearing running spikes can greatly increase the ability of the forefoot to scrape the ground, which has a good auxiliary effect on the acceleration of sprint. The sprint experience is that running with spikes 100 meters can improve the performance by 0.5~0.8s, which is very obvious.

Note that different runways should use different nails, plastic runways must use short nails, and other runways (cinders and dirt roads) should use long nails.

Short nails are generally less than 5mm in length (small inside diameter), long nails are generally 8 mm ~ 10 mm (large inside diameter), and professional running shoes (such as Nike, Mizuno, Puma, Reebok, etc. ) are made of superior materials, high-strength ceramic nails, and ordinary running shoes are aluminum nails or iron nails.

The number of nails under the nails is related to the strength of the user. The more nails there are, the greater the demand for strength. Generally, nails 5 and 6 are technical and suitable for sprinting. 7, 8 nails are strength type, suitable for hurdle or long jump run-up. The strength type can use 7 or 8 nails to exert force, and the technical strength difference can use 5 or 6 nails.