Answer:
Grip.
Step-by-step explanation:
In sports where a lot of running or stability on ground is required (baseball, American football, soccer, etc.) having spikes that can penetrate the ground increases running efficiency and speed.
Gripping is basically holding tightly (firmly) on to something, and in this case, the spikes on the shoes sole grip the ground so that you can push towards the ground stronger, and propel yourself further.
Hope it helped,
BiologiaMagister