Global stay-at-home mandates implemented in response to the COVID-19 pandemic are having substantial negative effects on mental health. Developing approaches to maintain the mental health of all individuals during this unprecedented time of physical distancing is of paramount importance. In the proposed low cost randomized controlled trial (RCT), the investigators seek to answer whether the use of a mobile app that provides a variety of physical activities appropriate for home workouts \[i.e., high intensity interval training (HIIT), yoga\] can improve wellbeing and health in adults mandated to stay at home. Should the results of this trial support the efficacy of the intervention (via app delivery), this has the potential to be implemented and delivered rapidly and at scale.

Engaging in regular physical activity confers reduced risk for mental disorders (e.g. depression, anxiety) in clinical and non-clinical populations. The investigators' recent evidence also suggests that becoming physically active reduces depressive symptoms, as well as negative affect and rumination on a daily basis, while improving daily positive affect and a sense of control in highly stressed adults. With fitness centres currently closed by mandate, becoming physically active during the COVID-19 pandemic could prove to be a challenge for individuals who are typically inactive, those mandated to stay-at-home, or those who do not have opportunities to access outdoor spaces that provide the recommended two meters of distance between people. Thus, the investigators seek to support those living under stay-at-home mandates with access to mobile apps that provide opportunities to be physically active in the home environment.

The study will focus on physical activities requiring little physical space or equipment that are easily completed at home. The study includes yoga, a movement-based activity that promotes relaxation and mindfulness and only requires space for the full length and width of one's body, and a mat as equipment. Yoga has been shown to be effective in improving physical function and quality of life in RCTs. The study also includes whole body weight (WBW)-based HIIT, which also only requires a mat, making it an excellent home-based form of aerobic exercise. HIIT is characterized as bouts of high-intensity exercise combined with periods of recovery or lower intensity activity. Its physical and psychological benefits compared to continuous moderate intensity training are often evidenced to be equal or significantly stronger.

Aims. The primary outcome will be a measure of depressive symptomology. It is hypothesized that those who actively use the yoga and/or WBW-HIIT mobile apps will improve in their depressive symptomatology compared to the waitlist control group over the course of the 6-week RCT. The study will also include measures of, as secondary outcomes, psychological distress, quality of life, and self-reported physical health, and expect decreases in distress and increases in the remaining outcomes. The researchers will also investigate whether effects are stronger in those (a) who currently live alone vs. live with others, or (b) with poorer levels of psychological health pre-randomization.