If you try to install Flash and are unable to do so, the easiest solution is to

install a browser with flash support included:

Install either Firefox

or Opera

Both are excellent web browsers with award winning features. 

Once installed you should be able to select a video and play it.



Top Tip:

When doing knee flexion and extension in sitting. position the calf pad by maximally dorsi-flexing the foot. Then lower the calf pad onto the top of the foot.

This position is both comfortable and consistant whilst minimising tilting of the pad on the shin.