Foam rolling can release tension and improve circulation to various muscles. Rolling the calves can be helpful after running or any activity that involves jumping and impact, to reduce tightness and soreness the following day. 

You can find our other exercises in the foam roller series here:
50 – Foam Roller: ITB
51 – Foam Roller: Quads
53 – Foam Roller: Glutes and Spikey Ball