What type of weights should you not use if your goal is to build muscle mass? Free weights, weight machines, high intensity Heavy weights, low intensity lighter weights.

If your goal is to build muscle mass, it is generally recommended to avoid using low intensity lighter weights. Low intensity lighter weights are commonly used for endurance training and may not provide enough resistance to effectively stimulate muscle growth. Instead, you should focus on using high-intensity heavy weights, as they can create the necessary muscle stimulus for hypertrophy. Additionally, free weights (dumbbells, barbells) are typically more effective for building muscle mass compared to weight machines, as they activate more stabilizing muscles and allow for greater range of motion.