After obtaining height, weight, and vitals, a catheter (IV) will be placed in a hand vein and heated in a warming box prior to each blood draw. Participants will rest for approximately 30 minutes prior to measuring lipid oxidation rate using indirect calorimetry (True One 2400, Parvo Medics, Sandy, UT). Participants will lay supine while a hood device is placed over their head for 15 minutes to measure oxygen consumption and carbon dioxide production in order to determine lipid oxidation rate34. After the initial indirect calorimetry measurement is taken, basal blood collection will be obtained. Basal insulin and glucose levels will be used to calculate maternal insulin resistance via a homeostatic model assessment-insulin resistance (HOMA-IR). After this blood draw, participants will exercise at approximately 50% of their predicted VO2max (based on the YMCA submaximal cycle test) for 30 minutes on the recumbent cycle ergometer (Lode Corvial, InMed, New South Wales, Australia). Blood will be collected at various time points during exercise. Indirect calorimetry (using a mouthpiece, nose clip, and exercise version of the software) will also be performed for 2 minutes at a time to measure lipid oxidation and total body oxygen consumption during low-level exercise. After exercise termination, participants will return to a supine position. Recovery blood draws will be taken and indirect calorimetry will be performed.