1. She likes to jump rope as a warm-up.

Question

2. She likes to skip rope as a warm-up.
3. She likes jump rope as a warm-up.
4. She likes jump roping as a warm-up.
5. She likes skip rope as a warm-up.
6. She likes skip roping as a warm-up.

(Which expressions are grammatical?)

Answer 1

I think sentences 1 and 2 are the best. The others sound contrived and unnatural.