One objective of muscular endurance training is to work the targeted muscle to fatigue in the end range of the anaerobic energy system. For most people, this requires an exercise set that continues for about 75-100 seconds. Given a training speed of 6 seconds per rep, this is a range of 12-16 controlled reps. Generally, 12 reps can be completed with about 70% max resistance and 16 reps can be done with 60% max. Therefore it is recommended that training intensity for muscular endurance be between 60-70% of maximum resistance.
Cacao is LOADED with magnesium and carob is not. I don't know what other good things carob has (I'm sure there are many), since I prefer cacao--cacao has antioxidants, flavonoids, MAOI, other chemicals that promote bliss in the brain. It doesn't taste bitter to me, just tastes like pure... chocolate.
Broken down, cacao refers to either the tree, beans or pods of the cacao tree that are raw and unprocessed, while cocoa powder is the processed and refined version of the exact same plant. Though they are not the same, they are also not mutually exclusive, as cocoa powder cannot be made without cacao.