“…In the last years, a novel modality of muscle contraction, iso-inertial (Tesch, Fernandez-Gonzalo, & Lundberg, 2017), is gaining more scientific interest for its potential applications. Muscle contraction is also the anatomical base on which an efficient and individualized training program can be developed (Jiménez-Reyes, Samozino, Brughelli, & Morin, 2017), also for people with disability (Spera et al, 2019) (Montesano, Tafuri, & Mazzeo, 2013), and this concept is still not clear for most people (Palermi et al, 2020).…”