Weak

Last night instead of just doing my normal cardio routine, I went on the bike for 15 minutes and then decided to shake things up a little.  I did 100 cruches (50 normal and 50 side ones, 25 on each side), 15 squats, 12 lunges, and 12 push-ups.   I WANT my legs to ache or my butt to be sore.  I would LOVE for my abs to hurt in that feels-really-good-because-I-know-it-was-good-for-me kind of way.  But do you know what hurt me the most? The 12 push-ups. 

Here's what hurts.  Put your hands on your waist like you're angry at your kids.   Now, slide your hands up your sides until they're right under your armpit.  Right there - that's where it hurts.  I don't even know what muscle it is - Wikipedia tells me that it might be my "rotator cuff" or the upper part of my "latissimus dorsi." 

Either way, I don't care - I hate it!  Usually when my muscles are sore there is some sort of stretch that I can do to help make them feel better.  How do you stretch your under-arm-pit muscle?  In fact, I find it hard to believe that there's even muscle there! All I really feel is rib bone with some skin covering it.  But there must be a thin layer of muscle between the two, and that layer is NOT happy. 

The only thing that offers even a slight bit of comfort is massaging them with my thumbs or the palm of my hand.  But I'm at work, and when my co-workers walk into my office and see me rubbing what appears to be the outer sides of my chest, I would get funny stares, something that I don't really want to deal with.

I've known for a long time that I have absolutely no upper-body strength.  In fact, I'm surprised that I could even pull off 12 push-up (girl-style, mind you) at all. 

I'm weak.  I need to do something about that. 

Any suggestions for good exercises to help tone my arms and upper-body?  I have hand weights of the 3, 5, and 8 pound varieties!