Boost your endurance and take your fitness to the next stage with this 4 day intermediate cardio-focused workout program. Combining interval training, running, cycling, and metabolic circuits, this plan leverages varied workouts to increase aerobic capacity and burn fat. The mix of moderate and high intensity sessions provide seasoned exercisers with diverse stimuli to continually progress. Expertly designed periodization allows your body to adapt and perform. Want to level up your conditioning and cardio fitness? This 4 day intermediate plan will challenge your lungs and legs for enhanced endurance. Requires no equipment.