Have students use a piece of scratch paper to figure their maximum and target heart rates. Ask for some volunteers to report their figures. Check to be sure students have figured the heart rates correctly. The recommended target heart rate is 60 to 85 percent of the maximum heart rate. The target heart rate range for a twelve year old is 125 to 177 beats per minute.
Students practice taking the pulse.
Give students time to find their pulse. When all students have located the pulse, have them count the pulse for 10 seconds. Ask some students what their pulse was and write the numbers on the board. Have students stand up behind their desks and spread out at arm's length from one another. Have them perform 25 jumping jacks.