You're a healthy adult who is trying to incorporate more physical activity into your life. you should strive for at least minutes of exercise per day. question

According to the American Heart Association, the recommended amount of minutes of exercise per day is thirty minutes per day, five days a week. The general recommendation is of at least 150 minutes in a week of moderate exercise, 75 minutes in a week of vigorous exercise or a combination of both types that matches this times.
So, the sentence is correct by adding "30" in the blank space: "You should strive for at least 30 minutes of exercise per day."

It would be 23 beats per second