Answer:
Target heart rate because you want to get your heart rate up but make sure your doing it in a safe measure as well.
Explanation:
My guess would be <span>hydrogen </span><span>ions, but...im not completely sure......</span>
i am a girl
i would spend the day with "the boys" and learn all their secrets to understand guys better
Nearly at age 25 your brain is plasticity is at its peak.
(It is different for everyone)
