Self-help expert and stretching guru Susan Clark has devised over 40 simple exercises you can sneakily squeeze in while in bed, at your desk, commuting, watching TV, in the bath and more. Stretching is the ultimate low-intensity exercise, with science-backed benefits including improved flexibility, toned muscles and a stronger core – and it might even increase your life expectancy. You don't need any special equipment, and just 10 minutes of 'flexercise' each day will benefit your health.