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Objective: This systematic review aims to determine the effects of exercise on bone and muscle health in men with low bone density., Data Sources: An electronic search in the following databases was performed: Medline, AMED, Embase, Scopus, and SPORTDiscus between January 1940 and September 2021., Study Selection: Randomized or non-randomized trials involving any form of exercise in adult men with a densitometric diagnosis of osteoporosis or osteopenia and reported outcomes relating to bone or muscle health. Two independent reviewers screened 12,018 records, resulting in 13 eligible articles., Data Extraction: One reviewer extracted data into a pre-formed table, including characteristics of the exercise intervention, population examined, and primary and secondary outcomes. Study quality was assessed by 2 independent reviewers using the Tool for assEssment of Study qualiTy and reporting in Exercise (TESTEX)., Data Synthesis: Thirteen publications, originating from 6 unique trials, were eligible for inclusion, which assessed the effect of resistance training, impact training, whole body vibration, and traditional Chinese exercises. Resistance training was the most effective: it stimulates the replacement of adipose tissue with muscle, and in some cases, improved bone density., Conclusions: Exercise, especially resistance training, slowed down the natural progression of osteoporosis and sarcopenia in men. These benefits are reflected in enhancements to function, such as improved mobility and balance. Other exercise modalities, such as whole body vibration and traditional Chinese exercises, generated minimal improvements to bone health, strength, and balance., (© 2023 The Authors.)