Go Timer Interval Training Timer in Clamshell Packaging, Green/Black by GoFit INTERVAL AND CROSS TRAINING: Perfect for all types of interval and cross training EFFICIENT TRAINING: Optimizes your exercise time for efficient training BETTER RESULTS: Adds greater structure and discipline to your workout for better results IMPROVED PERFORMANCE: Bolsters anaerobic and cardio endurance for improved performance Increases your metabolic rate Perfect for interval training Increases your metabolic rate Use the Go Timer for all types of cross training and interval training