The concern, he said, was not so much the wrist as the side and hamstring muscles that have been underused.

Don't lean forward from the waist - it will lessen the involvement of the hamstring muscles - or backwards.

There are three hamstring muscles down each leg, one going to the outside, the others to the inside of the leg, but all attaching at the knee joint.

Tight hamstring muscles are often considered a risk factor for back pain, but are more likely a symptom than a cause.

The hamstring muscles activate in mid-swing phase to help decelerate the lower leg.

Let's take a lying hamstring stretch as an example.

A good hamstring stretch involves standing in front of a chair and placing your left heel on it.

We watch as she performs an elaborate routine involving hamstring stretches, press-ups and lunges.

Strains are common and generally improve without surgery but a ruptured hamstring tendon needs the two ends to be stitched up.

Surgeons tend to use either a part of the patellar tendon, a strip of the hamstring tendon or, less commonly, a section of the quadriceps tendon.

There seems to be some controversy as to how well a hamstring tendon regenerates after the harvesting.

He underwent surgery soon after, which included his anterior cruciate being replaced with a piece of his hamstring tendon.

He snapped hamstring tendons during a somersault dive in training, which then left him with one leg shorter than the other.

But what if you could predict with scientific accuracy when you were more likely to pull a hamstring or be struck down by flu?

Unless they wise up and pull a hamstring.

I felt that, unless he pulled a hamstring, there was no way he wasn't going to win.

The reason we worked together was that he kept pulling his hamstrings.

He returned to training for the 2012-13 indoor season and pulled a hamstring.

After his hamstring tear, the 21-year-old's selection contains an element of risk.

After four weeks out with a hamstring tear, he made his comeback as a substitute.

The way he worked to shake off a hamstring tear was typical of his professionalism.

A massive hamstring tear has sidelined him for five weeks.

The result: a hamstring tear.

Long has tight hamstrings, a condition which has to be managed carefully.

I have tight hamstrings, even without the suit.

I missed the first two qualifiers because of tight hamstrings but, thankfully, the guys won those games without me.

He's got very tight hamstrings and hip flexors.

Factors that make it more likely include tight hamstrings, poor footwear (particularly if you have flat feet), hill running and a change of surface (eg from soft off-road to tarmac).

At least his sore head might have distracted him from the pain of his torn hamstring.

The opener sizzled in a net session and took a scorching catch (left) after missing two games with a torn hamstring.

All come with a torn hamstring as standard.

The midfielder has not played for 11 games due to a torn hamstring.

Surgery on a torn hamstring meant he would not play for his boyhood club again.