About #1: it takes about a month of sim racing for these muscles to develop. After a while, you even forget it used to be hard. About #2: That's why you have

About #1: it takes about a month of sim racing for these muscles to develop. After a while, you even forget it used to be hard. About #2: That's why you have special seats and rigs in sim racing. Your position is more at an angle and not fully vertical. Never expect a normal gaming chair to be of help for this.