Guys idk how to get one punch man i got to the end and there was no gym option after i stamped on his face
stamp until enjoy your succes and hit the gym option shows up
maybe you didn't do 25 $ difficulty? :\
stamp his face once push him off and second option allows you to hit the gym from there you do 100 situps 100 pushups and squats then you do a ten km dash got that on hardest difficulty