I got a concussion yesterday and was knocked out. i have no symptoms today though. how long until i can do physical activities?

Guidelines: Strict guidelines are now available from several sources. American academy pediatrics have published good ones. No contact sports for couple weeks after full recovery. If repeated concussion, no contact sports for full season at least. Good health habits should be maintained. Appropriate exercise and good sleep and diet are important. Your coach should know the guidelines.

Soon: Typical return to play after a concussion occurs once a patient has full resolution of concussion symptoms and signs. Then, return to physical activity in a gradual fashion. This "rehab" program varies, depending on what activity or sport you are hoping to return to. If basketball for example, run or stationary bike on day 1 and progress over a 5-day period leaving full contact until the end.

See sports med: Concussion recovery is in steps. 1. Clear symptoms for 48+ hours. 2. Exertional protocol for 5 days (biking, run, wt lift, noncontact practice, full practice). U need to be assessed before starting, while doing each step and at end to be cleared.