My colleague Robert Estrin of Living Pianos recently posted a great video tutorial on how to warm up at the piano. There are some great tips for all musicians!
He talks about staying healthy and taking breaks. He also mentions the importance of stretching.
Here is is clip on how to warm up at the piano:
Here are some keyboard warm-ups, courtesy of my colleague Irina Gorin. These are geared towards beginner piano students:
Finally, check out my series on musician stretches: