Les Mills GRIT is a high-intensity interval training (HIIT) workout designed to boost cardiovascular fitness, increase strength, and build lean muscle in just 30 minutes. This intense workout combines powerful music, motivational coaching, and a variety of exercises using barbells, weight plates, and bodyweight movements to target all major muscle groups1. Whether you choose GRIT Strength, GRIT Cardio, or GRIT Athletic, you’ll experience a challenging and dynamic session that pushes your limits and delivers fast results