Procrastination and laziness may be kinds of akrasia, but simply because that are the type most talked about here does not mean that they are an exhaustive description of "weaknesses of will". One example I find easy to bring up is trying to move while we are in pain. There are definite moments where a crisis of will occurs, and if you have a sharp shooting pain in your leg while walking you will either change your movement against your intended direction or overcome that moment and escape the akrasia for a time.

I do, however, suspect that this community would do a better job at fighting akrasia if we did not confound it solely with procrastination and "laziness".