Background: Most Ghanaian youths engage in weight training mostly for bodybuilding with littles attention to biochemical, physiological, and anthropometric changes on the long run. This study investigated the effect of duration of training (DOT) on biochemical, physiological, and anthropometric parameters of weightlifters. Materials and Methods: University setting and a cross-sectional descriptive study design were adopted. Sixty-six adult male weightlifters with a mean age of 25.98 ± 5.66 served as study sample. Modified Behavioral Regulation in Exercise Questionnaire-2 was administered. Self-reported DOT (grouped into 0–12 months, 1–5 years, and >5 years) and demographic and lifestyle information were collected. Anthropometric, physiological, lipid profile, total protein, albumin, globulin, and glomerular filtration rate (GFR) data were obtained. Results: Most of the participants greatly valued weight training (scale of 5 = 4.63 ± 0.89). Longer DOT was significantly associated with increased chest circumference (P = 0.013), arm circumference (P = 0.010), and diastolic blood pressure (P = 0.038). Statistical significance was only observed for dietary supplement intake and plasma globulin levels (P = 0.030). Association between GFR and dietary supplement intake was insignificant (P = 0.256). Conclusions: Weight training positively influences biochemical, physiological, and anthropometric indices of weightlifters. Investment in and motivational intervention in weight training would be beneficial to health lifestyle. A study with larger sample size on elite weightlifters could elicit further findings.