In the earlier seasons, he played football and was going to play in college. In the later seasons, he started selling real estate.

What happened ?

There was an episode where he had a career ending injury.

There was an episode where he had a career ending injury.
I beleive it had something to do with his spine and if he continued to play football he risked being paralized.

I beleive it had something to do with his spine and if he continued to play football he risked being paralized.
Yup. In season four the episode Diamond Jim Brady he finds out his spine is narrowing. He starts to sell real estate after asking Reba for the job in the second to last episode of season four Help Wanted.

Oh ................ ok. thanks !