Add more exercises (see attachment).

Created attachment 62
Exercises

I changed the fist roll a little:
 <exercise>
   <title>Fist roll</title>
   <title xml:lang="nl">Vuist rollen</title>
   <description>Put your underarm on a table and make a fist. Roll your
fist away from your body untill it rests on your nuckles. Keep it for
2 seconds and roll it back. Repeat this 5 times for each hand. If the
muscle is stretched to much, let your fingers rest on the table while
rolling.</description>
   <description xml:lang="nl">Leg je onderarm op tafel en maak een vuist.
Rol je vuist nu van je af, totdat deze op de knokkels steunt. Houd je
arm 2 seconden vast en laat hem terug rollen. Herhaal dit 5 keer voor
elke hand. Als de spanning van de spier te groot is, laat je vingers
dan op de tafel rusten bij het rollen.</description>
   <sequence duration="30">
     <image src="shoulder-arm-stretch.png" duration="10"/>
     <image src="shoulder-arm-stretch.png" mirrorx="yes" duration="10"/>
   </sequence>
 </exercise>

Furthermore it may be necessary to add (to the installer and maybe to the
rest breaks as well) a warning that: 'all exercises are to be done at your
own risk. If in pain or unsure if the exercise can be done with your
current injuries, please consult your doctor or therapist.'

Hope to have some more time to think up some more exercises.