Inclusion Criteria:  History of childhood cancer History of prediabetes (HbA1c 5.7-6.4%) In remission at time of enrollment Time between completion of cancer-directed therapy and study entry: >= 6 months At least 18 years of age at time of enrollment Able to access online exercise program at home Ability to tolerate the prescribed resistance exercise program English-speaking Able to understand and sign the study specific informed consent form (ICF)  Exclusion Criteria:  Taking a nicotinamide adenine dinucleotide (NAD)+ precursor in the two weeks prior to enrollment Currently taking medication for hyperglycemia or diabetes Females who are pregnant or planning to become pregnant Currently recovering from an injury Contraindication to magnetic resonance imaging (MRI) Pacemaker