Immediate breaks after starting your shifts?

I just started working at Chick-fil-A last week, and the managers often make me take my break very soon if not immediately after I start my shift. I don’t mind the work, but sometimes I will be on my feet for 6-7 hours straight, and my family has hereditary back issues so I’m worried for my health. Is this normal? I feel as if this violates OSHA regulations. Is this normal for Chick-fil-A or should I address this immediately? Any advice would be deeply appreciated.