Cycling builds up the back, glutes, and legs, but not the abs really at all, IMO. You can end up with back problems from this unbalanced situation just like I did, because the abs can't counteract and counter-balance all the forces being exerted elsewhere.

I like doing planks for abs, very simple, they work the abs right where you need them for cycling, and a minute or so is usually enough.



"Bird Dogs" are also helpful for strengthening the lower back, and lower abs to some extent, so that the two areas have somewhat equal strength and can balance each other out while you're on the bike.