My mom and a few friends are PTs. I can say they all had different paths. My mom studied pre-med and discovered PT while on a summer job in a lab in a hospital. My other friend was a coach for a college sports team and then went into PT. Another friend worked for the the government working on electrification in developing countries before going back to get her pre-reqs to become a PT.
The one thing they all had in common was a passion for science. That was key. There jobs were all quite different, but having an interest in biology, chemistry and anatomy really helped them go on this path.
Hope that helps!