Get your students thinking, scheming, and brainstorming! The more the mind is exercised, the stronger it becomes. Start with the simple 1-minute brainstorming activities. Then build mental muscle with the 2- and 5-minute activities. Brainstorming helps students warm up at the beginning of the day or the class period and gets them exchanging ideas. Brainstorming is also a great idea generator for creative-writing exercises.