What is more beneficial to a childs dance training? Practice days in a row (ex M-Thurs), or spread them out so they have a break (ex M,W,F)?

I am training a competitive team for dancers aged 7-11 and I was wondering what may be a better scheudle for their muscle development, routine work, and flexibility work. Is it better to do all practice days in a row an give them a wider break or spread spuratically through out the week.
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