RI is defined as the weight used for X number of reps in relation to the maximum weight with which you can accomplish X number of reps. For example, suppose you can squat 225 pounds for an absolute maximum of 10 reps. Nonetheless, you are training with 205 pounds for sets of ten. You are achieving a RI of 205/225 = 91 percent. The key to using relative intensity effectively is to understand how it works and how to adjust your program based on how you feel during each workout. If you can do more than six repetitions at absolute failure with good form, add weight to the bar. If you can't get past three reps, drop down to less weight or change modes. Don't worry about percentages; just keep adjusting the weights until you reach your desired level of intensity. Here are some other examples using common exercises: For bench press, let's say you can lift 90 pounds for eight reps. That would be considered very heavy exercise intensity. At this point, you should be able to complete two more reps with 100 pounds. So, your new RI is 90/100 = 90 percent. If you can only lift 70 pounds for four reps, then the exercise is too easy. Drop the weight to now where you can lift 80 pounds for five reps. Your new RI is 70/80 = 87.5 percent.