Which is not a safe practice while exercising?

Trying to test how much u can lift. That could cause serious injury and a lot of strain of muscles. Which is unsafe.

Explanation:

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lifetime activities are certain actions that are either required throughout your life or you choose to do them. for example, eating is considered a lifetime activity, drinking water or other beverages, keeping your body clean, taking medicine. those types of actions are considered lifetime activities.

i think the answer would be b.