>>76592963
>get toned
Yeap.
>get a nice ass
Nope.
You will need to apply some resistance. Girls telling they got their pretty butts only by callisthenics are complete liars or carry VERY good genetic material.

So can the average skinny chick build an ass like this over time in the gym or is it all genetics?

>>76309954
After years of lifting I can confirm squats build great legs, not glutes. Full stop.
If you wanna get yo'ass bigger do hip thrusts, bridges, stiffed RDLs even wide-stance leg presses will contribute better.
>pic NOT related, that's genetics