Are push-ups and pull-ups useful for women?
Yes, pushups are definitely useful for women. Strength training is strength training, irrespective of the gender.
Pushups will strengthen your forearms, biceps and those hard-to-tone triceps on the back of the arms. The pectoral, or chest, muscles are also strengthened for a more firm breast area. You can adjust the position of your hands on the floor to focus more energy on your chest or shoulders. i.e by spreading the arms more wider than the shoulder width.
Also, by doing pushups, you will experience core strengthening, which stabilizes the core for better posture and balance.
Pushups work your abdominal muscles without twisting or moving the spine. Your spine remains stable throughout the exercise so that strengthening is focused on the arms, chest, upper back and core.