Wunda Chairs, a staple in Pilates equipment, utilize tension springs to provide adjustable resistance for a wide range of exercises. These springs play a critical role in tailoring the intensity of the workout to suit different fitness levels and goals. The most commonly used spring tensions are red and green, each offering a distinct level of resistance.
 
Red spring 3.5mm wire diameter. Load KG 40
Green spring 3.2mm diameter Load KG 26
 
Spring length (including rings) 35cm