“One of the issues with our field is when we’ve looked at activity, and what controls activity, we’ve forgotten that we know very clearly there are biological mechanisms that actually influence people to be active or not” Lightfoot says. “You can have a predisposition to be a couch potato.”

“One of the issues with our field is when we’ve looked at activity, and what controls activity, we’ve forgotten that we know very clearly there are biological mechanisms that actually influence people to be active or not” Lightfoot says. “You can have a predisposition to be a couch potato.”

— David Epstein