Stretching is so so good for you. Before I dance, I always stretch–it warms up the muscles and gets you focused on the next part of class.
A very beginner ballet stretch is to stretch the feet to prepare for pointing the toes. Here’s how to do it: (How do you like my little bunheads?)
First sit up tall on your sits bones, legs outstretched. Point your toes up to the sky, flexing toward your torso until you feel a good stretch. Then point your toes forward trying to touch the floor with your toes. Make sure your knees remain on the floor and you back stays straight. Do 10 reps holding each stretch for 10-20 seconds.