Postpartum recovery

A friend of mine had a vaginal birth w/epidural a little over a week ago and is up and recovering well and not in any pain. She’s even already had sex on day 8 pp. anyway,my first time giving birth, I couldn’t even sit straight without pain up until 8 weeks. And didn’t have sex until 10 weeks. Given I had a tear and few stitches. My question is how do some women heal so quickly? Is there anything I can do to cut my healing time in half? I’m pregnant with my second and I’m terrified of the recovery process.