The answer is general decrease As we got older, our metabolic system will tend to become slower. This makes older people tend to have lower heart rate compared to younger ones because you need your blood to circulate the oxygen all over your body if your body is doing a metabolism process.
a. because id she keeps excerising more and more she could pass out, get a heat stroke, or could possibly get cardiovascular diases sorry i just woke up so if i spelt anything wrong please tell me
