Discussion - My 5 year old is sore after sports

My 5 years old son has just been diagnosed with MD. They think its BMD but there is a possibility that it is DMD. He gets really sore at the end of the day. He wants to play soccer and I would love him to. Do you think he will be able to do it? I dont want to have to restrict him from anything but I don't want to see my baby in pain.