Determine the maximum heart rate and the target zone for a 30 year old. 1. Maximum heart rate 2. Target zone to beats/minute 1. 190 2. (220-130=190) (190 x .6 = 114), (220-130=190) (190 x .9 =171) The primary fuel used for a 100 meter sprint would be Carbohydrates In what types of activities are fats an important source of energy? Fat is an important energy source for activities lasting more than 20 minutes that are performed at a low or moderate rate such weight lifting, hiking or a fa...