As a woman it is really important to stay down as long as you possibly can to allow your uterus and accompanying muscles to shrink back and lie where they need to go. Prelvic prolapse(your uterus actually falling out of your vagina) is really common for women(80% have it by age 50) and childbirth and high activity levels make it worse. Studies have shown that women who lay flat and are down longer after birth actually have flatter stomachs postpartum them those that push it and start exercising because they have allowed their body to heal.
For our clients our general rule (regardless of how easy the birth is):
3 days in bed up only for bathroom
4 days in bed able to sit up as needed with 1 hour a day on the couch etc.
1 week only sitting in the home(no cleaning lifting etc.)
1 week mild work around the house(dishes etc.)
no exercise until bleeding stops
no running/ab work until at least 8 weeks pp (this is really hard on our womanly parts)
It sounds extreme but our clients have great success in breastfeeding, low bleeding, low levels of pp depression and low prolapse levels (both my preceptor midwife and I have severe pelvic floor prolapse issues so it hits true to home for both of us).