Resistance exercise refers to any type of physical activity that requires an individual to use their muscles against a resistance force, such as weights or elastic bands. The goal is to increase strength and endurance by pushing one's body beyond its normal limits. This can include exercises like weightlifting, push-ups, pull-ups, squats, lunges, and many others. Resistance exercise is an important part of a well-rounded fitness routine as it helps to build muscle mass, improve bone density, increase metabolism, and promote overall physical health.