Before starting the workout, ensure that you have warmed up your legs and back with some light cardio and mobility exercises. For back squats, ensure that you have proper form and technique. Keep your chest up, core tight, and knees tracking over your toes. If the weight is too heavy, reduce it to maintain proper form. For double-unders, focus on timing and rhythm. Keep your wrists relaxed and jump with a slight bounce. If you're unable to do double-unders, modify with single-unders or jumping jacks. This workout is a high-intensity interval training (HIIT) workout that will challenge your cardiovascular endurance and leg strength. Push yourself to maintain a consistent pace throughout the rounds, and finish with a cooldown involving stretching, particularly focusing on the legs and back.