Why do gymnasts apply a coarse substance to their hands ?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Context**: Gymnasts perform various routines that require them to hold onto apparatuses like bars, rings, and beams. A good grip is essential for safety and performance.

2. **Identifying the Problem**: The hands of gymnasts are naturally smooth, which can lead to slipping when holding onto equipment. This can be dangerous and affect their performance.

3. **Introducing the Coarse Substance**: Gymnasts apply a coarse powdery substance, often referred to as chalk or grip powder, to their hands before performing.

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