The fitness world has pretty much bid farewell to certain exercises that just don't work, like sit-ups. But there are others that, while perfectly fine for men who work out, aren't always safe for women to do. Check out the following moves that fit femmes should nix. Then go kick some workout butt, girlie.

Move to Lose: Forward Lunge
Women have wider hips, which means their Q-angle – the angle at which the upper leg bone meets the lower leg bone – is more extreme than in men. The result? "Women tend to be more quadriceps and adductor [inner thigh] dominant and weak in the glutes and hamstrings," says Christopher Warden, CSCS, author of "Unlock Your Strength." Forward lunges exacerbate this imbalance.
Try this Instead: Warden suggests reverse lunges, which place less stress on the knees and emphasize glute and hamstring strength. As an added bonus, lunging backward promotes strength and balance around the knee and hip joints.

Click here
to see five more fitness moves that are bad for women.

Move to Lose: Chin up/Pull up
Men tend to have more natural upper-body strength, so unless a woman has already worked up to some serious upper-body buffness, these moves put chicks at serious risk of shoulder, bicep and /forearm injury.
Try this Instead: "Try lying on the floor with a bar resting on a squat rack and with palms facing you, pull yourself up toward the bar and lower back down to the floor," says Tim Moore, PhD, a health and fitness consultant in Marina Del Ray, California. "It's all the benefit of a chin up, none of the injury potential." Or use an assisted chin/dip machine at the gym.

Move to Lose: Plyometric Exercise
Trying to "jump into shape"? Explosive, repetitive exercises like jumping rope work in some sport-specific training regimens, but otherwise, it's just too much pounding. "Because of the Q-angle issue, plyometric jumping exercises are potentially dangerous and not necessary for the average female," says celebrity trainer Keli Roberts. "Even elite female athletes sometimes have problems with these types of exercises." Hormonal fluctuations and muscle firing patterns can make women even more susceptible to injury.
Try this Instead: Working hard on a stationary bike or elliptical machine provides the same calorie-burning, cardio benefits of plyometric exercises -- without all the impact.

Weirdest Fitness Equipment

    10. The Bullworker
    This strange device works on the principle of resistance, and with some effort and a little ingenuity, could be fashioned into a murder weapon.

    9. Rock 'n' Roll Steppa
    Thank ponytailed fitness guru Tony Little for this one. The Rock 'n' Roll Steppa tests your balance by making you rock and roll back and forth. Sounds nauseating.

    8. GyroGym
    The world's largest hamster ball.

    7. Aquavee Portable Swim System
    What is the Aquavee Portable Swim System? A rubber band. That's it. A rubber band you tie to your waist to provide resistance while you swim. Someone is making money selling people a glorified rubber band, people.

    6. Hoopnotica
    We're pretty sure this is just a hula hoop, but the creators of the Hoopnotica workout swear it's a revolutionary exercise device. Nope, it's a hula hoop.

    5. Thighmaster
    Who doesn't love the Thighmaster, Suzanne Somers' revolutionary muscle strengthening device? Sadly, the Thighmaster is no longer in production, so if you've got one, hold on to it (and squeeze those thighs tight).

    4. Velcro Shoes
    Jog with these velcro shoes to provide added resistance -- and lots of additional velcro-y noise -- to your work out

    3. Slendertone Flex Belt
    The Slendertone Flex Belt emits electrical pulses to your abdomen that cause your muscles to contract. So if you're too lazy to do ab crunches (like us), you can shock your muscles into shape!

    Slendertone Flex Belt

    2. Hula Chair
    The Hula Chair was invented by "Alexander Innovation Wizard" and as the demonstration video shows, it operates kind of like a hula hoop, except the chair does all the difficult work.

    1. Barbell Phone
    It's a phone with a barbell attached. It's a work out phone. It's a really really bad idea.

Move to Lose: Russian Twist

This challenging move -- which consists of leaning back in a sit-up position and twisting your torso, often while holding a medicine ball -- seems like a killer way to work the side waist. Unfortunately, "Any fast, jerky movement combined with rotation can be dangerous for the lumbar spine," says Geralyn Coopersmith, author of "Fit + Female." "Women's increased joint laxity makes it even more so."
Try this Instead:
Bicycle crunches work the obliques just as well: Lie back on the floor, keeping your lower back connected to the floor the entire time. Holding your abs tight, bring opposite knees and shoulders toward one another in a pedaling motion.

Move to Lose: Straight-Leg Push-up

Straight-legged push-ups require not just upper body but core strength. While men have more upper body power and can knock out push-up after push-up, women start to tire faster, which usually leads to drooping hips and lower-back strain.
Try this Instead: Stick to "girlie" push-ups where your knees stay on the floor. "Keep your abs tight, back flat and focus on working your chest muscles instead of letting your knees support you, and you'll get the benefits of a straight-legged push-up with minimal risk of injury to your shoulders, neck or spine," promises physical therapist Andrea Zujko.

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Move to Lose: Yogic Inversions

Nothing like a good yogic shoulder or headstand to get your blood flowing to your brain right? But when you've got your period, you might want to skip it. Why? "According to yoga theory, inversions reverse the flow of what your body is trying to release," says Johanna Aldrich, co-owner of Sonic Yoga in New York City. "While it is a personal choice, many teachers and yogis prefer to avoid these poses during menstruation."
Try this Instead: Enjoy a relaxing child's pose, or lie down with your bum up against the wall and your legs straight up the wall. It gives you the same off-your-feet benefits.

Motivated now to get in shape ... the right way? Visit AOL Health to find out how. Or check out Alexa Stevenson's Lemondrop blog about her quest to find an exercise she doesn't hate.