HI Doctor, I Wanna Ask You That My Butt Looks

HI Doctor, i wanna ask you that my butt looks so curvy and back pain looks little pulled forward it's exactly like anterior pelvic... how can i reduce this ? is there any medicine for this ? before 5 years i do martial arts now working in office always sitting... after getting tomy work i think it's becomes more, and also i feel some back pain sometimes. Help me doctor. Thank you