Fibromyalgia is a chronic disease with diverse physical and psychological symptoms and impairments. The present pilot study aims to evaluate the implementation of a previously protocoled online resistance training program in postural balance, physical fitness, and fibromyalgia impact, as well as adaptations and strategies necessary for a better follow-up of the participant during the program. Three participants with an average age of 53.67 (SD=5.51) years and medical diagnosis of fibromyalgia performed eight weeks of online resistance training exercises (2/week). Physical fitness and postural balance (force platform), fibromyalgia impact (FIQ), and symptoms (VAS) were evaluated before the exercises and after 16 sessions. The variation from pre to post-training intervention was determined by calculating the percentage of change in each variable. All participants showed gains in countermovement jump (11 to 46%), and a reduction in pain intensity (10 to 19%). Two out of three participants showed improvement in the countermovement jump with free arms (4 and 28%), medicine ball throw (2 and 42%), mood state (20 to 32%), also a reduction in FIQ (4 and 27%), center of pressure (COP) velocity with eyes open (10 and 7%), COP displacement with eyes open (6 and 9%), anxiety (15 to 84%) and fatigue (10 to 41%),. Only one participant has shown improvements in sleep quality (6%). Benefits on balance with eyes closed was not found. The online resistance training program protocol showed promising results in this pilot study, with potential gains in neuromuscular performance and balance, and reducing the negative symptoms associated with fibromyalgia. Adaptations were necessary throughout the program for better applicability.