Heart Rate of 10-12 Yr Olds

Based on my results, before doing jumping jacks, the 10-12 year old subject's heart rate read 83 beats per minute (bpm). After doing jumping jacks the 10-12 year old subject's heart rate read 96 bpm, that is a difference of 13 bpm. Before doing jogging, the 10-12 year old subject's heart rate read 82 bpm. But after doing jogging for two minutes, the 10-12 year old subject's heart rate read 92 bpm, that is a difference of 10 bpm. As it is shown in my data table, before doing sit-ups the 10-12 year old subject's heart rate read 72 bpm. After doing sit-ups for two minutes the 10-12 year old subject's heart rate read 88 bpm, that is a diffenence of 16 bpm.
Before doing jumping jacks, the 20-25 year old subject's heart rate read 78 bpm. Unlike the heart rate before doing jumping jacks, the 20-35 year old subject's heart rate read 100 bpm, that is a difference of 22 bpm! Before doing jogging, the 20-35 year old subject's heart rate read 78 bpm. But after jogging the 20-35 year old subject's heart rate read 96 bpm, that is a difference of 18 bpm. The starting heart rate of the 20-35 year old subject before doing sit-ups read 71 bpm. After doing the exercise, the 20-35 year old subject's heart rate read 92 bpm, that is a difference of 21 bpm!
Based on my results, before doing jumping jacks the 40-45 year old suject's was 80 bpm. After doing jumping jacks for two minutes the 40-45 year old subject's heart rate read 100 bpm, that is a difference of 20 bpm. Before jogging, the 40-45 year old subject's heart rate read 82 bpm. After this exercise, the 40-45 year old subject's heart rate read 96 bpm, that is a difference of 14 bpm. Before starting the sit-ups, the 40-45 year old subject's heart rate read 85 bpm. but after doing this exercise for two minutes the 40-45 year old subject's heart rate read 96 bpm, that is a difference of 11 bpm.
As it is shown in the data table, the subject 10-12 years old got its heart rate higher with jumping jacks. The subject 20-35 years old