Resistance Training in Women Diagnosed with Breast Cancer: A Pilot Single Arm Pre–Post Intervention

<b>Background:</b> Resistance training (RT) yields physical and psychological benefits for women living with and beyond breast cancer (WBC). This study examined the feasibility of a virtually delivered 8-week socially supportive RT intervention among WBC and assessed changes in physical activity and body image. <b>Methods:</b> A pilot single-arm 8-week pre-post intervention study design was implemented. Forty-one WBC were matched as exercise partners and asked to complete two RT sessions per week-one with a qualified exercise professional (QEP) and one with their peer. Data were collected at baseline (T1), post-intervention (T2), and 20 weeks post-baseline (T3). <b>Results:</b> The enrolment rate was 42%, the attendance rate for the QEP sessions was 63.8% and 40.0% for the peer sessions, and the retention rate was 87%. No adverse events were reported. Total weekly minutes of RT significantly (<i>p</i> < 0.05) increased by 42 minutes/week during the intervention and significantly decreased by 25 min/week at follow-up. Upper and lower body muscle strength increased (<i>p</i> < 0.01) during the intervention. Increased RT was associated with favorable activity self-perceptions. <b>Conclusions:</b> This pilot intervention study was feasible, safe, and demonstrated preliminary evidence for increasing RT time and strength among WBC. Virtually delivered socially supportive RT interventions can improve access for WBC.