Anyone have any ideas as to why I might feel shaky after working out? I almost always do at least a little bit, but not enough to worry me. But tonight I only got about 20 minutes in (on the exercise bike) and my legs felt like bricks. Once I was finished I felt pretty shaky and a little nauseous. I'm HOPING it's one of two things (or both) - I didn't have as much water as usual today and I didn't get much sleep last night.
Should I worry?