Sometimes I think I have a really hard time with rhythms, and that it's by biggest "weakness" in music. I've been reading and playing music for a while, and this seems to be the most frustrating thing. It's not only when sightreading that rhythms may confuse me, but even if I see rhythms a second, third, fourth, etc. time, I still have to sit down and figure out how it goes. This is most common with dotted rhythms, when something is in cut time, rhythms beyond 16th notes, syncopation, or odd meters &/or changing meters. I'm sure this a problem for a lot of musicians, but I would think my rhythm would be better by now, and the worst part is sometimes I even mess up simple rhythms when sightreading.
I feel like I need a book or a website that is designed specifically to improve rhythm. I know I can sightread to practice, but I don't think that's enough. I need something that will allow me to hear and see a rhythm, so that when I come across it in real music, I will automatically know how it goes. Does something like this exist?