great advice!
our neurologist urged NO physical activity (even stationary bike) until he goes a FULL 7 days straight without ANY symptoms (even the dullest headaches)...
if a concussion symptom occurs - the 7 day count must start all over.

had someone passed that on to us before, my son's premature return to sports costed him an additional, and much worst 7 weeks recovery

hope your son has a speedy recovery!