as far as 15 goes, never miss a session unless you are sick, or injured, or find that school or family or life interferes occasionally. This is a lifetime activity if properly done, so realize that you can make some changes occasionally. Many people fall of the bandwagon because they think exercise must be done now or it is not effective. If you look at a one year period, one or two missed workouts will not kill you. Stressing over those two missed workouts will cause you more problems. Also, working out while sick does not help and just continues to spread infections (like how you got yours).
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