Fewer than thirty-three percent of adults adhere to exercise recommendations thereby increasing their risk of chronic diseases. This lack of participation may be due to lack of knowledge or skill in proper execution of exercises. Incorrectly performed exercises may decrease maximum benefit as well as increase the risk of injury. The ability to provide real-time exercise analysis feedback may improve exercise adherence and self-efficacy as well as reduce the risk of injury. PURPOSE: To examine if a newly designed approach of analyzing time-series exercise data collected by a camera can detect errors committed by participants. METHODS: Recreationally active males and females (N = 58) were videotaped performing 4 common exercises: squat (SQ), lunge (LU), jumping jacks (JJ) and high knees (HN). Each participant was randomly assigned to perform two of these exercises. Participants performed a maximum of 10 repetitions or to volitional fatigue. Time-series data from 15 body segments: head, neck, shoulders (2), elbows (2), wrists (2), spine, hips (2), knees (2) and ankles (2) were analyzed while performing these exercises. Potential errors in critical elements of performing these exercises were identified by a panel of experts. Geometric correlations of the spatial and temporal data were encoded to evaluate exercise performance. By analyzing the slope of the lines between the pairs of joints, angles and correlations, exercise errors were detected. RESULTS: In total, 98 data sets were collected: JJ (35), SQ (28), LU (23), HN (12). Error detection rates were: SQ (94.6%), JJ (92%), LU (90.6%), HN (88.3%) meaning that the respective percentage of exercise errors were detected when compared to the expert panel’s criteria. Fewer errors were detected with the high knees exercise. CONCLUSIONS: The system appears to be a low-cost effective means of providing real-time guidance in detecting exercise errors in 4 commonly performed exercises thereby potentially reducing the risk of injury and increasing adherence. Findings from the study reveal the value specially designed technology may have on teaching and assisting in proper execution of these selected common exercises.