You've probably been told that you should warm up before exercise, but has anyone shown you how?
The only drawing warm-up exercises you need
12 simple Warm-Up Exercises that will Transform your Drawing Practice
Warm Up Exercises for Drawing — Carrie L. Lewis, Artist
The Perfect Warm-Up
Flyer Design Portfolio — Richard Gebin
Duplication Warm-Up Drawing Exercises
12 simple Warm-Up Exercises that will Transform your Drawing Practice
The Perfect Warm-Up
The Art of the Warm Up - 4 Crucial Keys
5 Minute Drawing Warm Ups to Start Art Class - The Kitchen Table