I have a pull bar this one it is 48 inches in-width and spans out 32 inches with the "pullup" portion of the bar located 30 inches into the spanned out end portion.

I would like to know how deep should I make the post hole?, how wide?, rebar? etc. I would like the 4x4 to be 48 inches apart and 7.5 feet above ground. I would like to keep the post deflection at a minimum (if none at all). The pullup bar will be used by someone who is 300lbs so the post must be able to withstand the force of 300lbs muscle up and clap pullups (basically a 300lb man hanging from it and swinging) (the pullup bar is capable, the only questions are the post)

My plan was to make each post hole (2 post) 15 inch diameter by 48 inch deep, and on the 4x4 in-ground portion drill out some holes to friction place some rebar through the post so that it protrudes on each side a few inches in a attempt to help the concrete bond to the post better and better "stabilize" the post.

I have a pull bar. It is 48 inches in-width and spans out 32 inches with the "pullup" portion of the bar located 30 inches into the spanned out end portion.

I would like to know how deep should I make the post hole. How wide? Should I use rebar? I would like the 4x4 to be 48 inches apart and 7.5 feet above ground. I would like to keep the post deflection at a minimum (if none at all). The pullup bar will be used by someone who is 300lbs so the post must be able to withstand the force of 300lbs muscle up and clap pullups (basically a 300lb man hanging from it and swinging) (the pullup bar is capable, the only questions are the post)

My plan was to make each post hole (2 post) 15 inch diameter by 48 inch deep, and on the 4x4 in-ground portion drill out some holes to friction place some rebar through the post so that it protrudes on each side a few inches in a attempt to help the concrete bond to the post better and better "stabilize" the post.