Begin with a dynamic warm-up, including exercises such as jumping jacks, high knees, and arm circles. For hand release push-ups, ensure that your chest touches the ground and your hands release from the floor before pushing back up. Modify with regular push-ups if needed. In walking lunges, maintain proper form with your front knee tracking over your ankle and your back knee hovering just above the ground. If 30 reps are too challenging, reduce the number or modify with reverse lunges. For sit-ups, maintain a consistent pace and ensure full range of motion. If 19 reps are too challenging, reduce the number or modify with crunches. This workout is a high-intensity interval training (HIIT) workout that will challenge your cardiovascular endurance and muscular strength. Focus on maintaining good form throughout each round and aim to finish as quickly as possible while still maintaining proper technique. Finish with a cooldown involving stretching, particularly focusing on the legs, chest, and core.