I disagree about "no women are able to bulk up". I bulk up very quickly.
If you are prone to acne and are good at maths, have a longer ring finger than index, and good spacial relation (IE you can parallel park on a dime) then you will bulk up, as you have sensitive testosterone receptors.
I only have to look at a weight for my muscles to pop.
I burn fat fast and have high stamina.
I like yoga as it stretches out my muscles so I get a lean silhouette. Pilates is great for toning up the core. Also belly dancing, swimming, and using a hula hoop.
I have to be careful with weights not to lift too much, or I can't wear my suit jackets! My biceps just burst the seams.
I do reps of low weights, and wear very light Velcro weights on wrists and ankles, anything bigger than that and I'm massive.
Friends who are in the same type of profession are the same. (Science, engineering and Medicine (surgery)).
There's no rule about not bulking up if you're a woman. You will bulk up if you're sensitive to your testosterone.