For the last 7 weeks I've been on crutches, following a foot operation.
I found, much to my annoyance/sadness etc, that due to my left hand grasping the crutch handle tightly, my left index finger has become weaker and doesn't stretch out so far from my middle finger.

This means that I can't play bar chords properly at the moment - the finger can't press down firmly enough on the fretboard.

Other than practice, is there any other good exercises / techniques I should try to try to strengthen the finger and improve its reach?