Aging is associated with adverse changes in body composition and physical function. Loss of muscle mass and a concomitant gain in body fat may consequently increase the risk of chronic diseases. However, it may be difficult to separate the effects of “true aging” (i.e. inherent aging) and a physical inactive lifestyle. This is supported by studies showing that life-long trained elderly subjects do not decline in physical function compared to age-matched sedentary counterparts (Lazarus and Harridge 2010). Furthermore, exercise training can reverse the physiological degeneration observed with aging (Melov et al. 2007). Typical exercise training interventions for an elderly population include aerobic activities, e.g. cycling, walking, or strength training activities. Results from recent studies suggest that small-sided football training may represent a motivating and health promoting exercise alternative (Krustrup 2010). However, none of these studies have so far investigated the effect of floorball training on body composition in elderly untrained men. Thus, the aim of the present study was to investigate the effects of floorball training on body composition in elderly untrained men.Twenty untrained subjects aged 65-77 years took part in the first round of a 12-week training intervention study. Of note, the study is on-going and fifty subjects total are expected to complete the training intervention, hence, the present results are preliminary. Subjects were randomized to either a floorball group (FLO; n=10) or a control activity group playing petanque (CON; n=10). Whole body fat content and fat free mass were determined before and after the 12-week training intervention using Dual-energy X-ray Absorptiometry (DXA), and fat free mass to fat mass ratio was calculated. Data are presented as mean ± S.E.M compared by ANOVA. Visceral fat content and physical function, i.e. maximal oxygen uptake (VO2max), time to exhaustion during incremental cycling, and 6 min maximal walking distance were also examined (results not shown in abstract).In FLO, after 12 weeks of training, whole body fat content was 8.5% lower (25.8 ± 3.4 vs. 28.0 ± 3.3 kg, P < 0.05), whereas no change was observed in CON (24.9 ± 2.8 vs. 25.2 ± 2.8 kg). In FLO, fat free mass to fat mass ratio tended to be higher with a 10.1% increase (2.65 ± 0.54 vs. 2.40 ± 0.46, P = 0.08), with no change observed in CON (2.48 ± 0.29 vs. 2.44 ± 0.27). No change was observed in fat free mass in either FLO (57.8 ± 2.4 vs. 56.9 ± 2.1 kg) or CON (55.1 ± 1.6 vs. 55.4 ± 1.6 kg).Preliminary results indicate that 12 weeks of floorball training lowers whole body fat content, leading to a more favorable body composition in elderly untrained men. The on-going intervention study will add more knowledge to whether floorball training also positively affects visceral fat content and physical function.