I have strained the back of my thigh muscle. Do I rest it or work it?

My advice would be to keep mobile but, in this case, don't do anything too strenuous like running which is likely to put more strain on the area. Gentle activies like swimming or walking will be much more beneficial and should help to ease the tension.

For some extra help in easing your pain you could apply   Atrogel^®. This is made from fresh Arnica montana flowers and helps with reduce pain from strains and sprains.

Best wishes

Earle