What is Strength?
Strength is our ability to move a joint against a force or resistance. Often the aim with these types of exercises are to increase the strength of the muscle involved or close to the injury.
Resistance can be provided by a weight or band but we can also apply resistance using body weight or opposing forces.
It is often normal for you to feel some discomfort or soreness during after these types of exercises as in order to build strength you must put the muscle under some controlled stress. Generally the soreness/discomfort should not last more than a day and often gets easier the more times you complete them.
Rehab
At this stage try these simple strengthening exercises :