You do not need a gym membership or expensive equipment to stay in great shape. Bodyweight exercises like push-ups, squats, lunges, and planks engage multiple muscle groups simultaneously and can be progressively overloaded over time. High-intensity interval training (HIIT) can be done in as little as 20 minutes and delivers impressive cardiovascular and metabolic benefits. Consistency matters far more than intensity — a moderate workout done daily beats an intense workout done occasionally.