Balletnewbie

Hi complete ballet newbie here! I was just wondering how do you know that extra classes like stretching and pbt are actually beneficial for a dc and not just a way to make more money? Should dc be a minimum age or grade before starting these classes? Or as I'm Any insight would be grateful received Thanks

Hi complete ballet newbie here! I was just wondering how do you know that extra classes like stretching and pbt are actually beneficial for a dc and not just a way to make more money? Should dc be a minimum age or grade before starting these classes? Or as I'm Any insight would be grateful received Thanks