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Undersun Fitness’ Frequently Asked Questions

  • How do you start the program?

    Getting started is as easy as a few simple steps:

    Step 1: Click on the “Workout” tab on the top menu of the Undersun website and login

    Step 2: Click on the “PROGRAM OVERVIEW” for step by step instructions on how to follow the program. If you have additional questions you can click on the “FAQ” button

    Step 3: If you’re ready, click the “START WORKOUT” button

    Step 4: On the workout calendar, click Day 1, which will take you to your first workout

  • What makes this program different than other resistance band programs?

    Most of the resistance band programs out there are designed as full-body workouts. The downside of this style of training is that it's almost impossible to give each muscle group the concentrated attention they need to maximize muscle development. TA2 was designed using a weekly muscle building "split" with each muscle-group trained on separate days. This approach allows for multiple exercises per body-part, a higher quality of work, and ultimately more muscle.

  • Are Undersun Resistance bands made out of Natural Latex?

    At Undersun we appreciate the outdoors, so protecting the environment is important to us, which is why we chose to use Natural Latex.  Not only is natural latex a renewable resource but it’s also biodegradable and recyclable.

  • What if I'm allergic to natural latex?

    According to the American Latex Allergy Association, a national non-profit organization that provides educational information about latex allergy, less than 1% of the general population in the US has an allergy to natural latex.  

    If you have an intolerance to natural latex products you may not be able to use Undersun Resistance Bands. If you choose to use the bands anyway, it is recommended that you cover exposed skin with gloves, a long sleeve shirt, and pants. For more information on Latex Allergies please visit

  • What is Time Under Tension (TUT)?

    In any given rep or set structure, it isn’t just about how many reps you do, that determines how hard a muscle works. What you’re really looking at is Time Under Tension (TUT) which is the total time that your muscle is under tension in the concentric, isometric and eccentric phases. If you have a 1-second concentric contraction, a half-second isometric and a 2-second eccentric, then your TUT per rep would be 3 ½ seconds. If you take the number of reps and multiply it by the TUT, you get the total Time Under Tension for the set. 

    If we look at the TA2 program, in Sets #2 and #3, we have a rep speed of approximately 3 ½ seconds, multiplied by 10 reps, which gives us a TUT for that set of roughly 35 seconds. The ideal TUT for muscle size and strength gains (hypertrophy) the ideal range is 30-70 seconds. In Set #4, although we have 15 reps as opposed to 10, our TUT is very similar. Let’s compare: Using an explosive rep speed of less than 1-second on the eccentric and concentric, and no pause on the isometric, we have a TUT per rep of less than 2-seconds. Multiply that by our 15-reps and we have roughly 30 seconds.  As you can see, although we’re doing more reps, our TUT is less, but still in that ideal range for building muscle.

    One of the peripheral benefits of Set #4 is that we’re also driving more blood into the muscle. Besides the fact that we all like the way a good muscle pump feels, it also serves a muscle building purpose. By driving more blood into the muscle, along with it comes muscle building nutrients like glucose and amino acids.

  • What does the name "TA2" stand for?

    TA2 stands for “Train Anywhere. Train Anytime”, and with the TA2 Muscle Building program, paired with Undersun Resistance Bands, you will have the freedom to do precisely that. Don't be fooled with all that flexibility though, TA2 is a true muscle building and strength program.

  • How do resistance bands compare to free weights?

    Resistance Bands have most of the same benefits as traditional free weights, and even a few advantages. 

    Let’s first let's look at how they are similar:

    • Both provide progressive resistance, meaning that as you get stronger you can progress to heavier levels of resistance in order to continue making strength gains (progressive overload).
    • Both allow for variable-speed, meaning that you can perform your reps at different speeds (both fast and slow) to create either more or less time under tension for each rep and set.
    • The last major difference is the free-range of motion or movement. Unlike machines where you are locked into a plane of movement, with both bands and free weights you can move freely in any plane.


    Now let’s dive into the advantages of resistance bands:

    • Unlike free weights where the resistance is fixed throughout the range of motion, in an exercise, resistance bands create what is called Linear Variable Resistance. The more you stretch a band, the more resistance it creates. This “variable resistance” more closely matches the natural strength curve of your muscles, where you are typically weaker at the start of a movement and stronger toward the end.
    • Bands also have Resistance in Multiple Planes. Free weights only create resistance in the vertical plane, as they resist the force of gravity. For example, with any chest exercise you have to lay on a bench in order to press the weight up. With bands you can do a chest exercise standing, sitting, laying down or probably even on your head if you really wanted to.
    • When using free weights, there are many exercises where you don’t get Resistance Through the Full Range of Movement. A great example is doing biceps curls. As you near the top of the range of motion, your arms are in a somewhat locked position, which takes tension off your biceps. Like we talked about with variable resistance, you want to get more tension at the peak of a movement, not less. When using bands you get maximum tension even at the peak of contraction.
    • The next benefit is one that it’s easy to dismiss, but in fact it actually may be one of the most important – and that is by training with bands you are far Less Likely to Cheat Your Reps. Let’s go back to our example of doing biceps curls. This is one exercise where we’ve all seen someone swing their body to get those reps. By swinging you are using momentum to help get the weight up, instead of forcing your muscles to take on the full load. With bands you cannot create momentum, so even if you wanted to swing your body it would be pointless. This forces you to use better form and make your biceps do the work not your low back. Another added benefit of this is that with less cheating (which means bad form) it drastically reduces the chance of injury. Remember that progress isn’t just about moving forward – it’s also about not moving backwards, which is exactly what happens when you get injured.

    The last two benefits of bands over free weights are simple. Bands are light-weight and portable,which means that you are no longer confined or limited to just training in the gym. Now you can take your workouts anywhere you want to go (and won’t ever have to wait for someone to get off a bench)and since you don’t have to go to the gym, you can also potentially save a ton of money on gym memberships. You would be blown away at the statistics on what Americans spend on gym memberships each year.

    Here's a quick reference chart of how resistance bands stack up against free weights:


  • Is there a heavier resistance level than the extra-heavy band?

    One of the great things about resistance bands is the portability, so why haul around more bands than you need? If you want to go heavier than the X-Heavy band, just stack it with another band for more resistance. For example, the X-Heavy band paired with the Heavy band equals a maximum resistance of almost 200 pounds. That’s a lot of resistance for 2 bands that barely weigh more than a pound.