My thought was what if she developed Thunderous thighs as a result of the events of Alpha. What if her Alpha outfit was a gym uniform of some kind or something (I'm sure it isn't, but this is where my mind went.)
Anyway, one of the best ways to get thunderous thighs is squats so that's why she's doing squats. This is her transitioning from her body type on Alpha to her body type afterward.
Drawing squats is almost as hard as doing them.