Maybe they bend over and back up again, repeatedly, until they've built up muscle tone?
Goshdarnit, I was just about to say that. It seems like you've beat me to the punch, you flying guinea pig, you. XD
Well getting a six pack is more of burning the fat covering the abdominal muscles through cardio and a good diet. So you know I'd assume the horse body allows for a pretty good aerobic workout.
Goddammit, we don't ask questions like this... Some things just happen.
An extremely low BMI?
Maybe we just need some attractive creatures
Maybe they inherit it...?
I would imagine that their build and skeletal structure demands that they have toned abdominal and back muscles, in order to keep up proper posture. I can't even picture them lying down and sleeping, though, to be honest... But anyway.
They also don't exist. It's like discussing the biology of a mermaid.
WHY DID YOU HAVE TO SAY IT?!
Because it always comes back to the unsolved mystery of how they have babies.
Why? Dolphins have babies, fish lay eggs. Mermaids would be like dolphins. Not really a mystery.
1. It's a joke. 2. Most pictures don't exactly depict mermaids having vaginas, that's the mystery.
ewwwwwww mermaid penises...
1) i know, why so serious? 2) you can't see a fish's vagina either. 3) i solved the mystery. You should be thanking me. Lol.
HOW DO THEY PEE?!