Exxentric Harness

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The Harness is essential for anyone looking to maximize the effectiveness of their flywheel training on the kBox. Its ergonomic design allows you to maintain the pressure in the shoulder region when you have a correct, upright position. However, if you tend to lean forward the pressure shifts down towards the lower back and shortens the lever for the force while reducing torque on the lower back, which results in fewer bruises and less back soreness.

How much would you be able to squat in the gym if your technique was not an issue? Imagine if you didn’t have to worry about balance, bruising on the shoulders, straining your back and needing a spotter. You would probably be able to squat a lot more.

For guidance on how to wear and attach the Harness to the kBox please watch our tutorial here.


The Harness is made of strong but still soft and light-weight material. It weighs just 950 g for the XXS size and 1300 g for the XXL. The cushioning on its shoulder pads can allow you to go all out when accelerating the flywheel in the concentric phase and they’re equally as comfortable when it comes to absorbing the impact in the eccentric phase of your movement.

Read more about the differences between the Harness and the Hip Belt here.

Size Guide

The Harness is available in all standard sizes from XXS to XXL, and can also be bought in discounted 3-packs or 5-packs.

The recommended waist measurements are 73 cm (XS), 78 cm (S), 83 cm (M), 88 cm (L) and 93 cm (XL). In inches, the recommended measurements are 29″ (XS), 31″ (S), 33″ (M), 35″ (L) and 37″ (XL).

Complete size guide:

CM Min Waist Max Waist Length Waist to Shoulders
XXS 66 82 70 45
XS 71 87 74 48
S 76 92 78 51
M 81 97 82 54
L 86 102 86 57
XL 91 107 90 61
XXL 96 112 94 64
INCHES Min Waist Max Waist Length Waist to Shoulders
XXS 26 32 28 18
XS 28 34 29 19
S 30 36 31 20
M 32 38 32 21
L 34 40 34 22
XL 36 42 35 24
XXL 38 44 37 25
Size XXS, XS, S, M, L, XL, XXL, 3-pack (S-M-L), 5-pack (XS-S-M-L-XL)
Weight 950 g – 1350 g per harness
Exercises Squats, lateral squats, split squats, lunges, calf press
Compatibility kBox (recommended), kPulley