I'm currently dealing with a sternum issue (what I think is costochondritis). After getting some advice from some smart people I know, I took a bit of time off from benching, and am bringing my grip in a bit as I start to bench again. The inflammation seems to be calming down, so I decided to try some very light bench, with the goal being to stop before it gets aggravated.
Bench Barx10 95x8 135x2x5 Stopped there, no pain
Prime handle tricep extension 4x12
DB bicep curl 4x12
Face pull 4x12
