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Background: Physical exercise training at the work place may prevent lifestyle diseases such as cardiovascular,metabolic,and musculoskeletal disorders.However,conflicting results have been presented regarding the effectiveness of worksite physical exercise training on health promotion which is true within jobs with low as well as high occupational physical demands.Mode of exercise training seems crucial for attaining positive effects in specific job categories.Knowledge on muscular adaptations with worksite training is essential for optimal training planning.