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Undersun Fitness’ Frequently Asked Questions

  • How big are each of the Undersun Resistance Bands?

    Each of the five different size bands are 41” in length, and 82” in circumference. The X-Light band is roughly ¼” wide, the Light is ½”, Medium is ¾, the Heavy is 1 ¼” and the X-Heavy is 1 ¾”. 


  • Do I need to wear gloves when working out with bands?

    For the best grip, and to avoid wear and tear on your hands, we recommend using gloves when working out with resistance bands.  Look for gloves with padding the goes all the way to the edge of the palm, which is where the pressure from bands is placed. You may also want to use full-finger gloves as some exercises place more pressure on the fingers.

  • How many times a week do you do the workouts?

    In the TA2™ HIIT & Tabata program, it’s recommended that you do the workouts a minimum of three times a week. To maximize your results you can do the program up to four times a week. Any more than 4x’s a week you will not be getting adequate recovery time.

  • Will the door anchor damage the door?

    Because of the soft foam used for the stopper, the door anchor should not damage your door, if placed properly. The sharp edges on some doors may damage the door stopper over time, so periodically check your anchor for damage, and replace if necessary.

  • 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 the TA2 HITT & TABATA program is no exception. Combined with Undersun Resistance Bands, this is a complete weight loss, and muscle toning program, that you can do wherever you are.

  • What is a concentric contraction?

    In a concentric contraction, the muscle shortens as it contracts. If you were doing a biceps curl, in this phase you would be curling the weight up. This contraction is about 1-second in time and needs to be powerful, yet controlled.

  • What bands come in a set?

    Each full set of Undersun Resistance Bands comes with 5 different levels of resistance, from X-Light, Light, Medium, Heavy and X-Heavy. These are the 5 most frequently used resistance levels, and when paired together you can create countless levels of resistance, for any exercise.