We asked experts to identify and correct our most typical exercise blunders.
Haley Perlus, PhD, a Colorado sport and exercise psychology specialist, believes crunches are painful because women engage their neck muscles more than their stomachs.
Before repetitions, push your tongue against the roof of your mouth to concentrate on your abs.
She believes this absorbs pressure at the front of the knee instead of engaging the right muscles.
Keep your front heel down to check your lunge form.
Sawlani recommends reverse lunges or single-leg bridges if your knees can't handle it.