Research Question: How will a 6-week UpEx-NTP improve shoulder function, pain, and joint position sense (JPS) in individuals affected by a rotator cuff (RC) tendinopathy compared to usual physiotherapy care? The primary objective of this randomized control trial (RTC) is to compare, in terms of symptoms and functional limitations, a group receiving a supervised rehabilitation program (UpEx-NTP) centered on strength and motor control training to a group receiving usual one-on-one physiotherapy clinical care in individuals affected by a RC tendinopathy of the shoulder. A secondary objective is to explore the effects of these interventions on joint position sense (JPS). It is hypothesized that both the UpEx-NTP (Exp) and usual physiotherapy care (Ctl) groups will equally demonstrate statistically (p-value < 0.05) and clinically (all noted changes above their MCID : DASH questionnaire = 11 points, WORC index = 12 points and the Numeric Rating Scale for pain = 2 points) significant changes in shoulder function and pain over a 6-week period in individuals with an RC tendinopathy and will be maintained over time, notably 3 and 6 months after the intervention. We further hypothesize that the Exp (UpEx-NTP) group will demonstrate a statistically significant improvement (again a p-value < 0.05) in JPS through the Shoulder Proprioceptive Reaching Test (SPRET) compared to the Clt group, due to the concentrated motor control and proprioceptive exercises of the UpEx-NTP. The Minimal Detectable Change (MDC) has yet to be established for the SPRET evaluation tool.