I recently had to have a set of injections. The first batch went in my arm and made my arm ache for a couple of days preventing me from climbing during that short period. A couple of weeks later the second batch was due, and this time I thought I'd be clever and request the vaccinations in my leg to enable me to climb still, or at least train on a fingerboard. This was a mistake! Do not repeat my decision. I have been hobbling around with a stiff leg for 3 days. Yes I have been on a finger board, but no it was not worth it.