Final answer:
Punching bags can provide a combination of cardio, strength training, and resistance training when used correctly. Additionally, they can help increase muscle tone by engaging various muscle groups.
Step-by-step explanation:
When used correctly, punching bags can provide a combination of cardio, strength training, and resistance training. This means that options 1), 3) and 4) are true about punching bags. As for option 2), it is not true that punching bags do not help increase muscle tone. In fact, when you punch a bag, you engage various muscle groups, including your arms, shoulders, back, and core, which can help improve muscle tone and overall strength.