<human>:  What is the best exercise to lose weight?
<bot>: The best exercise to lose weight is a combination of aerobic exercise and strength training. Aerobic exercises such as walking, running, swimming, and cycling are great for burning calories and increasing your metabolism. Strength training involves using resistance to build muscle, which also helps to burn calories and can help you keep the weight off long-term. A combination of both will give you the best results.