Inclusion Criteria:  Healthy adults between the ages of 21 - 70 Informed consent obtained and signed  Exclusion Criteria:  Self-reported medical conditions that could compromise a participant's ability to provide for all breathing samples, pedal the Cubii Pro elliptical, or follow instructions Self-reported medical history of respiratory or cardiovascular disease Excessive facial hair, facial deformities, or obstructions (like glasses or face masks/shields) that could compromise the recording of pulse rate and respiratory rate of the mCVI® Any face lotions or make up foundations that could compromise the recording of pulse rate and respiration rate of the mCVI® Missing digits or fingers on one or more hand that would prevent proper recording of Masimo pulse oximeter devices Participants wearing nail polish, acrylic nails, or rings on the ring finger of either hand that would prevent the proper use of Masimo pulse oximeter device Inability to provide informed consent