i need help combining loop with if statement

i want to add loop inside my code like if the input was no in (maty) the code will say try again and it will loop to Step on mat

mat = input("Step on mat : ")

maty = input("Is your weight between 40 and 50 ? : ")

if maty == ("yes"):
    h = input("Select your height on the scale : ")
    j = input("Is "+ h +" your height ? : ")
    if j == ("yes"):
        print("You are ready to go !")
    else:
        print("Try again")

if maty == ("no"):
    print("try again")  

im a beginner in python

thanks