Building and Sustaining Exercise Habits for Adults With Type 1 Diabetes

Inclusion criteria:

* 30-65 years old inclusive
* Diagnosis with type 1 diabetes (T1D) or other insulin deficiency diabetes (latent autoimmune disease of adulthood, diabetes secondary to pancreatitis)
* Less than 1.0 exercise sessions per week
* Smartphone ownership
* English literacy
* Under regular care by a healthcare provider (1+ appointments per year)
* Home Broadband wireless Internet or cell phone network
* Using continuous glucose monitor (CGM) and sharing data with medical record for at least 6 weeks
* Using insulin pump or pen and sharing data with medical record for at least 6 weeks

Exclusion criteria:

* Diabetic ketoacidosis not clearly related to pump site failure in past 6 months
* \>1 episode of severe hypoglycemia (altered mental and/or physical status requiring assistance from another person for recovery) in past 6 months
* A1c ≥10.0%
* Resting blood pressure \>160mmHg systolic or \>100 mmHg diastolic.
* Myocardial infarction or angina in past 12 months
* Uncontrolled arrhythmia (e.g., atrial fibrillation with rapid ventricular response, new onset atrial fibrillation, ventricular tachycardia, escape rhythms)
* Congestive heart failure (stage 3 or 4)
* Exercise-induced asthma (not controlled on inhalers)
* Chronic obstructive pulmonary disease (requiring home oxygen)
* Renal failure
* Pregnancy
* Cognitive impairment
* Severe retinopathy or neuropathy.
* Other chronic disease or physical disability that would influence exercise intervention (e.g., recent spinal surgery)