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Danielle R Bouchard,1,2 Marie-France Langlois,3,4 Katherine Boisvert-Vigneault,3,4 Paul Farand,5 Mathieu Paulin,5 Jean-Patrice Baillargeon3,4 1Faculty of Kinesiology and Recreation Management, 2Health, Leisure and Human Performance Research Institute, University of Manitoba, Winnipeg, Manitoba, Canada; 3Departement of Medicine, Division of Endocrinology, Université de Sherbrooke, Sherbrooke, Quebec, Canada; 4CRC Étienne LeBel, Centre Hospitalier Universitaire de Sherbrooke, Sherbrooke, Quebec, Canada; 5Departement of Medicine, Division of Cardiology, Université de Sherbrooke, Quebec, Canada Abstract: Most individuals do not reach the recommended physical activity level of at least 150 minutes of aerobic exercise (AE) at moderate-to-vigorous intensity per week. For example, only 13% of older Canadian adults reach World Health Organization physical activity guideline (PAG). One of the reasons might be a difficulty identifying the required intensity. Twenty-five inactive older adults received one session about the AE-PAG and how to use a tool or strategy to help them identify AE intensity: heart-rate (HR) monitor (% of maximal HR; N = 9); manual pulse (% of maximal HR; N = 8); or pedometer (walking cadence; N = 8). Participants had 8 weeks to implement their specific tool with the aim of reaching the PAG by walking at home. At pre- and post-intervention, the capacity to identify AE intensity and AE time spent at moderate-to-vigorous intensity were evaluated. Only the two groups using a tool increased total AE time (both P < 0.01), but no group improved the time spent at moderate-to-vigorous intensity. No significant improvement was observed in the ability to correctly identify AE intensity in any of the groups, but a tendency was observed in the pedometer group (P = 0.07). Using walking cadence with a pedometer should be explored as a tool to reach the PAG as it is inexpensive, easy to use, and seemed the best tool to improve both AE time and perception of intensity. Keywords: aging, pacing, aerobic exercise