To test our hypothesis, football players at our institution were invited to participate in this observational study involving measures of weight and body composition using dual-energy x-ray absorptiometry (DXA) at 3 time points: preseason, postseason, and spring season. We calculated changes in weight, lean mass, fat mass, and percent body fat at postseason (postseason minus preseason) and at spring season (spring season minus postseason). The mean change in each parameter was tested for significance (a change different than zero) and to see if there were differences by position, seniority, or the interaction between position and seniority. In-season and post-season training programs were obtained from strength and conditioning coaches. To link weight and body composition changes to performance indicators, we measured isokinetic strength of the quadriceps and hamstring using the Biodex dynamometer at all 3 time points. Unfortunately, data for postseason measures were lost due to software failure. We therefore rely on the training information to discuss the changes seen at postseason but are able to report isokinetic strength changes from preseason to spring season.