We have all seen what extreme workout plans can do to celebrities. From Madonna's over muscled arms to the French president Nicolas Sarkozy collasping on one of his daily jogs.

The reason, some experts believe, is that celebrities and celebrity trainers, have taken a more is more rather than a less is more attitute to exercise and working out.

While this workouts might be acceptable for Olympic athletes and movie stars training for a film (Jessica Biel trained for up to 5 hours a day for Blade Trinty), this will, eventually, prove too much for Joe and Jane Public who have to juggle exercise with working and bringing up children.

 Read other celebrity workouts here

Movie stars also tget in shape and rain specifically for a film role which might see them take their shirt off for a minute or two. That means the celebrity can tailor their workouts and reduced calories to look good on a given day. Trying to maintain this regime and low calorie diet over the long term is advisable, and most celebs and celebrity personal trainers understand this.

But when a celebs workout becomes public most of the public looking to gain the body of their idol will mimic a celebrity workout to the letter and find that:

1. They will spend excessive time in the gym
2. Dramatically cutting calories will make them feel tired and lacking in energy

It is this combination of increases in exercise and a reduction in calories that instantly becomes dangerous, as extra exercise will require a good level of nutrition.

What the general public forget this that such a workout and eating plan might only be sustained by the celeb for a month or two at best, rather than any longer.

Over exercise symptoms

Over exercising, or over training, can leave the exerciser with some or all of the following symptoms: 

• Feeling tired
• Lack of motivation
• Sagging, thin skin
• Dehydration
• Women may experience amenorrhoea - a reduction of periods
• A decrease of bone mass density
• Exercise induced injury
• Obessive feelings towards exercise

How much exercise is enough?

The UK government suggest that you should perform 30 minutes of moderate exercise 5 times a week, while the American College of Sports Medicine (ACSM), suggest exercising 5 days a week for up to 60 minutes at 55% - 80% of your heart rate maximum.

The ACSM have also shown that peoplewho exercise for 30 minutes at 80% of their heart rate maximum can develop the same gains as those who exercise for 60 minutes at 60% of their heart rate max. This means people short on time can still gain excellent improvements in fitness.

The Daniel Craig workout

Daniel Craig, the actor who stared as James Bond in Casino Royale, was voted the body most men atmired the most. However, unlike may movie stars training for a film Craig worked out for only 45 minutes, 5 days a week.

The difference in Craig's workout was that he didn't stop. He performed a selection of weight lifting moves without pausing for a rest. This means he held a high intensity during each workout, reducing his training time but getting in shape in only 2 months.

The moral of the tale? Give yourself less a time limit of 60 minutes to exercise and try to perform as much as possible in the time.