A)

When would it be appropriate to consider a sports drink instead of water to re-hydrate?
(1 point)
When lifting heavy weights for 30 minutes.
When running for less than 20 minutes.
When doing crunches and sit-ups for 15 minutes.
When walking for less than 45 minutes.

When lifting heavy weights for 30 minutes.

It would be appropriate to consider a sports drink instead of water to rehydrate when lifting heavy weights for 30 minutes.

To determine when it would be appropriate to consider a sports drink instead of water to rehydrate, we need to understand the factors that contribute to the need for a sports drink. Sports drinks are designed to replenish not only fluids but also electrolytes lost during physical activity. Electrolytes, such as sodium, potassium, and magnesium, help maintain the body's fluid balance and play a vital role in muscle function.

Considering the given options, we need to evaluate the intensity and duration of the activities mentioned.

- Lifting heavy weights for 30 minutes: While it can be physically demanding, this activity does not typically result in significant sweating or electrolyte loss. Water alone should be sufficient for rehydration.
- Running for less than 20 minutes: Unless you are engaging in intense running or sweating excessively in this short span of time, water should be enough to replenish fluids.
- Doing crunches and sit-ups for 15 minutes: These activities generally do not involve high levels of intensity or sweating. Water is appropriate for rehydration.
- Walking for less than 45 minutes: Walking is a low-intensity activity, and unless you are significantly sweating or engaging in brisk cardiovascular exercise, water should suffice for rehydration.

In summary, based on the given options, it would be appropriate to consider a sports drink instead of water to rehydrate when engaging in prolonged or high-intensity activities that lead to excessive sweating and electrolyte loss. Water should be sufficient for the activities mentioned in the options above.