The best weight to use for weight training in order to increase strength is one that a. is challenging but still allows for proper form b. is heavy enough to quickly reach exhaustion c. is light enough to prevent injury d. fits comfortably into the palm of your hand

A. Is challenging but still allows for proper form

Explanation:

To increase the strength in weight training one should opt for weights that are not too heavy but is challenging enough to hit the number of reps that one set for themselves.

Too heavy weight might affect one’s proper form and one might end up hurting oneself. The best weight is the one that make you struggle to achieve your set goals and you want to take rest before there are few reps left.

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