>>14644770I don't do much to focus abs
heavy compounds will force you to flex them to balance out your back muscles but other than that I just do planks
I think chin-ups help a lot too
If you can get access to an ab wheel I hear they're amazing, but I don't have one
if you're serious you should probably ask /fit/, I do it more for health and enjoyment than massive gains, which is why I'm not bulky