Feasibility and Usability of a Chest-Strap Ambulatory ECG Monitor in Active Individuals in Comparison With a Traditional Ambulatory ECG Patch Monitor (MoMe ARC)

Inclusion Criteria:

* Adult participants (\>22 years; Frontier X is approved for use in this age group) who participate in \>4 days a week of \>150 minutes total per week of moderate to high intensity exercise who were prescribed a ambulatory ECG monitor for clinical purposes for 24 hours or more.
* Patients must agree to wear the Frontier X monitor for the prescribed duration and use the Frontier X Plus application

Exclusion Criteria:

* Current use of Implanted Cardiac Devices
* Pregnancy
* Known allergies to any of the materials listed in the "List of Patient-Contacting Materials"
* Presence of skin injuries or broken skin in the area where the chest strap is worn
* Inability to use a compatible mobile device required for the operation of the study device
* Any cognitive or physical limitations that, in the opinion of the investigator, limits the participant's ability to fully follow study procedures
* Medical restrictions on exercise for safety including cardiac, orthopedic or other relevant past medical history