Physical Education for three and four year old children?

I am a new college grad and I'm working for a federally funded Pre_K Head Start program for three and four year old children in a poverty-level and low income area. The program is located within an elementary school. Our kids have to go to P.E. for twenty minutes and the instructor makes my kids do jumping jacks while chanting the ABC alphabet (which they haven't learned yet). The kids don't like doing callesthenics and they don't like this strange man. The coach complained to my Lead Teacher that I was interfering with his exercise routine since I was standing in the front of the cl, but off to the far right side. He never told me that he wanted me to stand in the back of the room so he would be directing my cl by himself. This all seems so wrong to me. These are three and four year old children. They aren't third and fourth graders. Exercise at this age is supposed to be enjoyable. These kids didn't like the difficult stretching and balancing moves and they were acting out because of frustration. I'm a new graduate and I'm very inexperienced with what goes on in elementary schools. Can anyone advise me on what is appopriate? Is this normal for elementary schools to teach the pre-K cl instead of allowing the Head Start Teacher to lead the kids herself in bunny-hiops and galloping-like-a-hors, or flying-lke-a-bird? I thought that learning at this age is all about making it playful and fun. Please advise. Thank you.