So what are the differences between compressed springs, tension springs, and torsion springs? How can we distinguish them?

Tension springs can directly suspend heavy objects; they can also invert a sleeve, with the upper end of the sleeve supporting the weight. Tension springs are used for chest exercises, and the current tension springs are generally dual-purpose, as they can also be used as grip strength tools; arm strength tools are used to train various muscle groups in the arms, and there are many training methods, the two types of equipment are fundamentally different.

Compressed springs can directly support heavy objects; they can also support a core rod, from which the lower end hangs the weight. For example, mattresses, sofas, and lighters utilize the properties of compressed springs.

Torsion springs (twisting springs) use the principle of leverage to introduce significant mechanical energy by twisting or rotating elastic materials that are soft and have a high toughness. They are springs that withstand torsional deformation, and their working part can either be tightly wound or loosely wound, like clothes clips or hairpin clips.