Which of the following are two common forms of resistance training?

Resistance training focuses on exercises that improve strength and endurance by working against an external force. Free weights and resistance machines are two prevalent forms of resistance training, as both engage muscles by providing resistance.

Free weights, such as dumbbells and barbells, allow for a greater range of motion and require stabilizing muscles to engage, promoting overall strength development. On the other hand, resistance machines offer support and guide movements, making them ideal for beginners and providing a controlled environment to isolate muscle groups. Utilizing both methods can enhance a resistance training regimen, addressing different aspects of strength building.

The other options listed, while valuable components of a fitness program, do not specifically focus on resistance training. Cardio machines and Pilates emphasize cardiovascular endurance and flexibility, whereas interval training and circuit training involve varying intensities and formats that can incorporate resistance exercises but are not solely defined as resistance training. Lastly, yoga and aerobics also prioritize flexibility and cardiovascular health, thus falling outside the scope of resistance training.