These women are all athletes. Olympic athletes, actually. Would you think they were athletes if you saw them on the street? Do we have an unfair idea of what an athlete looks like?
Fit doesn't always equal thin. Active and athletic doesn't always equal fit, either. Fit won't look the same on every person, so we can't all expect to look like a composite of the most desirable body parts of the women in the photo.
Even without achieving visual perfection being physically active will improve our bodies and our minds. Get out there and move!!