Hi Calza
sorry I just got your PM mate!
Ok sit back in a chair and cross one ankle over the opposite knee (make sure your ankle is right across the top of your knee and not bending inwards).
Your leg should be relaxed into a 4 sign position.
Now using your hip muscles press your ankle into your other leg, this will cause your top knee to lift with it as your thigh rotates inwards.
If you do this but place a hand onto the inside of your top knee as resistance so that it doesnt actually lift - this is called an isometric muscle contraction as there is no movement.
Now this muscle contraction should be done with no more than 20% of your maximum effort. Hold it for 20 seconds and then pout your foot down.
repeat 4 sets 4 times throughout the day.
What this does is is releases a small muscle in the hip called piriformis by reminding it how to relax.
The piriformis has a very close relationship with the sciatic nerve which if tethered down by the piriformis, can cause the hamstring to become over active trying to protect the nerve.
Does this help mate? If you need more let me know
'You can only manage what you can measure' Rachel France DipITS,MBCA
Master Trainer
Specialist Biomechanics Coach
(Injury '
prevention', Low Back Health & Resistance Specialist)