Hi Nancy!
Unfortunately, there is no exact answer to this question. A persons genetics, lifting weight, lifestyle, age, etc. all effect the outcome of this answer. The workouts are designed to build muscle mass by lifting slow and heavy. The recommendation is to do this series no more than two times per week because generally speaking, more than this could encourage over training.
Understanding this, there are also other ways to use these tapes. For instance, you could 1) lift lighter in general, 2) lift heavy the first time per week and lighter the second time per week, 3) lift once per week and alternate using heavy weight one week and light weight the next and the list goes on.
The key is to first, define your goals. Second, use the tapes starting with the minimum recommendation of one time per week for about 8 weeks and see if you are STARTING to achieve your goals. If not then go to twice per week and again, after about 8 weeks see if you are starting to achieve your goals. At this point most people who use the tapes once or twice per week will notice that the workouts are fulfilling their objectives. However, if you are not seeing the results that you are looking for, then you need to continue to make small adjustments to your fitness plan to see which formula works best for you. Keep in mind that it may take more than adjusting the lifting routine to achieve your goals. You may need to also (or instead) adjust your cardio routine or nutrition plan. Happy experimenting. Hope this helps!
