Which of the following activities would mostly rely on the aerobic system?
a. downhill skiing at a resort
b. sprinting 200 meters at the olympics
c. swimming a 50 meter freestyle race
d. throwing a javelin during a decathlon

This is one popular brand of exercise machine

Which of the following can be effective in preventing the onset of viral infection in humans? a) taking vitaminsb) getting vaccinatedc) taking antibioticsd) taking drugs that inhibit transcription

Mason joined the water polo team at his school. as part of his conditioning, mason's coach requires a 25-minute run during practice. mason's heart rate reaches 125 beats per minute, but his target heart rate zone is 138—183 beats per minute. what should mason do to get the most benefit for his heart? increase the amount of time he runs increase the speed at which he runs decrease the amount of time he runs decrease the speed at which he runs