Although in traditional solutions telemonitoring is a self-contained practice
limited to passively observing the patients, the need for remote sensing is crucially coupled with the need for coaching older adults in their daily living [4,5].
For example, a critical activity such as telerehabilitation cannot be limited
to observing the patients’ behaviors. Indeed, patient adherence and acceptability of rehabilitative practices need to be actively enhanced, overcoming pitfalls due to motor (e.g., endurance), non-motor (e.g., fatigue, pain, dysautonomic symptoms, and motivational), and cognitive deﬁcits. According to Rodriguez et al. , telerehabilitation can be formally deﬁned as:
“the application of telecommunication, remote sensing and operation tech-
nologies, and computing technologies to assist with the provision of med-
ical rehabilitation services at a distance.”
Patients, physiotherapists, and health institutes can gain several beneﬁts
from an extensive adoption of telerehabilitation systems . Considering the
economical point of view, Mozaﬀarian et al.  ﬁgured out that the total cost
of stroke in the US was estimable to be 34.3 billion dollars in 2008, rising up to 69.1 billion dollars in 2016.
Even though to date they are not precisely quantiﬁable due to insuﬃcient evidence , Mutingi et al.  presented as “inevitable advantages”
(i) a substantial cost saving primarily due to the reduction of specialized human resources,
(ii) an enhancement of patient comfort and lifestyle, and (iii) improvements of therapy and decision making processes. Moreover, Morreale et al.  mentioned one of the most appreciated beneﬁts: the increase of adherence to rehabilitation protocols.
The multitude of scientiﬁc contributions fostering telerehabilitation exploits
new technologies and various architectures to better understand and serve user requirements. However, due to technological or technical limitations, physiotherapists’ needs have not yet been completely satisﬁed. To ﬁll this gap, a system evolution is required. For example, telerehabilitation systems cannot oﬀer the same behavior to users with diverse conditions. Viceversa, according to the environment condition, they must rather be able to adapt themselves to the user needs .
Telerehabilitation is characterized by a very delicate equilibrium between
environment, devices, and users. Thus, the capabilities such as self adaptation, ﬂexibility, and ubiquity are crucial to facilitate and promote the usability and then the actual practices.