The key personal decisions that can influence your personal safety while exercising are... A making sure to replace lost fluids before, during, and after exercise
В. preparing for exercise in extreme temperatures
C choosing when, where, and how to exercise
D all of the above

D, all of the above

Explanation:

Each and every one of these are extremely important to the body. Hydration is key, exercising in extreme temperatures without preparing can easily lead to heat exhaustion or heat stroke, and when, how, and where can determine wether or not you increase the risks of getting injured.

D

Explanation:

Should be correct, sorry if it isn't.

Hope I helped! ^^

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when in a crucial situation, after calling 911, the correct posture for delivering effective compression is the proper hand placement.

first, place two fingers at the sternum, then put the heel of your other hand next to the fingers and place hand on top of the other. lock your elbows by using your body’s weight and compress the victim’s chest with a depth of 2 inches.

moreover, do 15 compression and 2 breaths, this process must be done four times until there is a pulse or a arrive.