I usually hit them 2-3 times a week with one seated and one standing move/ I go heavy and work in a variety of rep ranges.PLus I do a lot of high incline treadmill work. They come in pretty good after a while , but I have to fight for every inch. Plus I broke my fibula about 8 months ago and lost 3 freaking inches off of them due to ZERO lower body work and direct calf work.
I've put 2 inches back on in the past two months though, so eventually I'll get em growing. Just one of those problematic body parts for me that I have to prioritize, but as we all know they are boring as hell to work. I'm thinking about doing weighted carries with a safety squat bar while walking on my toes. That will throw in a conditioning element and not be so boring.