The best reason to use line drills in your training plan is to get a lot done in a short period of time. All gymnasts are working.
For compulsories, they are an excellent way to ensure you are getting many reps of simple skills.
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On the other hand … I’ve seen Gyms where kids get sick of line drills. Sometimes quality suffers with less able gymnasts.
A good compromise is to use line drills occasionally.
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