Whether you're trying to get the abs of your dreams or a perfectly pert bottom, there is a big fear amongst ladies that too much of certain types of exercise will make you big and muscular.
How much of this is true and what can you do to prevent it?
Women don't build muscle like men
Often, women who work out with their boyfriend or enjoy training with weights, find themselves worrying about getting as bulky as the men around them.
However, what is important to remember is that men and women have different metabolic and hormonal processes.
Virgin Active's senior fitness manager Steve Whittle explains, "Muscle growth is linked to the amount of testosterone in your body - males have 7/8 times more.
It is actually difficult for women to build up large muscles."
Everyone is different
Nutritionist Emma Wright Boycott explained to us that unfortunately there is no one answer for muscle development in women.
"Everybody is different so it is hard to say how much is too much in terms of exercise.
You are the best judge of this – ask yourself questions such as how fast do you put on muscle, how efficiently do you burn fat, and how efficiently do you process food etc.
Keep tabs on your routine and tweak where you need to," she said.
Think about your diet
If you are doing lots of weight training it is particularly important to try and eat protein as soon as possible afterwards so your muscles can start to repair themselves.
This is where protein shakes can come in handy.
However, obviously, if your muscles are building, using protein you're taking in, don't go eating six steaks after the gym if you don't want to develop big muscles.
That said, avoiding it out of fear of bulking up will not work. You will prevent toning and end up with seriously achey muscles.
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