High-Intensity Interval Training (HIIT) is another effective method that doesn't require a gym. HIIT involves alternating between short bursts of intense exercise followed by brief periods of rest or lower-intensity exercise. You can do HIIT with exercises like jumping jacks, burpees, mountain climbers, and high knees. This approach not only burns calories efficiently but also improves cardiovascular health and can be tailored to your fitness level. You can find plenty of HIIT workout routines online or create your own based on your preferences and fitness goals.