The inclusion criteria are:  Between the ages of 18 and 40. Body mass between 50 - 110 kg (110 - 220 lbs.). Either: (A) Resistance-trained, defined as completing 3+ resistance training sessions per week for at least two years prior to screening; full body (all upper body and lower body major muscle groups) must be trained at least once weekly, OR (B) non-resistance trained, defined as never having followed a structured resistance training program. Perform ≤ 30 minutes of high-intensity interval training per week. Perform ≤ 60 minutes of steady state endurance exercise per week. Regular caffeine consumption (due to the presence of caffeine in the commercially available dietary supplement). This will be defined as an average self-reported daily intake of 200+ mg of caffeine, which is equivalent to approximately 2 cups of coffee.  The exclusion criteria are:  Failing to meet any of the aforementioned inclusion criteria. Presence of any known disease or medical condition which could be negatively affected by consumption of the beverage. This includes cardiovascular disease or condition; liver disease or disorder; other metabolic disease or disorder; or other conditions that could reasonably be deemed to contraindicate the study protocol. Pregnant or breastfeeding, based on self-report (for female participants). Taking medication which could reasonably make participation unsafe for the participant or influence study outcomes. Specifically, use of any prescription stimulant (e.g., dextroamphetamine (Dexedrine®), dextroamphetamine/amphetamine combination product (Adderall®), methylphenidate (Ritalin®, Concerta®), or similar stimulants) precludes participation in this study. Self-reported caffeine sensitivity, as indicated by unwanted side effects when caffeine is consumed. Allergy to any of the ingredients in the RTD beverage. Presence of a pacemaker or other implanted electrical device Self-reported claustrophobia (due to metabolism testing)