I've noticed this when i walked into my rec center today get some work on my triceps when i realize that there is a lack of women in any of the gym sections other than the yoga studio or the occasional treadmills. But a lot of those women are just skinny with a lack of muscle tone. The only women i saw heavy in our rec center gyms were the student-athletes and intramurals members. 

Ever heard the term "Well *insert name* thinks i'm cute." A huge motivator is attention from the opposite sex.

even the ones that were had a healthy weight. Just shyt stamina, how you get slumped tired from flag football and dodgeball when the class only 45 minutes long? 