What do the numbers and letters with each exercise mean?
The exercises are ordered either by number (1,2,3, etc.) or by a number/letter combination (1, 2a, 2b, 3, etc.). The number represents which order the exercises should be performed in and how to progress through multiple sets of an exercise. If each exercise has only a number, then you are to perform all the sets of exercise 1 first, all the sets of exercise 2 second, and so forth. If there is more than one exercise with a given number (e.g., 2a, 2b, etc.) they are to be done together as supersets. Instead of performing all the sets of exercise 2a before moving on to exercise 2b, you would perform one set of exercise 2a and then one set of exercise 2b, alternating back and forth between the exercises marked with a 2 until all sets have been completed. After all the 2 exercises have been completed in the alternating fashion, you would move on to the exercise (or group of exercises) marked 3 (or 3a, 3b. etc.). An example will make this clear.
