Anxiety, Mood, and Health Behaviors in Young Adults

At each of the six exposure sessions, participants will be invited to engage in 2-minute warm-up on the treadmill. Following this warm-up period, participants will be asked to briskly walk or jog on the treadmill at a speed that maintains their heart rate at 60-80% of maximum age-predicted heart rate for 20 minutes using the formula: (220-age) x (0.60 \[lower bound\] or 0.80 \[upper bound\]). Participants will be fitted with a heart rate monitor, which will be checked by a research assistant at 5-minute intervals in order to ensure adherence to this prescription; participants will be asked to adjust treadmill speed in order to remain in this range. Following each 20-minute exposure, participants will complete 5 minutes of cool down walking on the treadmill. Assessments will take place at baseline, week 2 (post-intervention), week 4, and week 8.