Summary of intervention component targeting psychosocial variables.
Note: Behavior Change Techniques from Abraham & Michie [Sessions were approximately 30 minutes total including a five minute warm-up, 20 minutes of HIIT, and a five minute cool-down. The sessions were progressively overloaded using bodyweight. For example, a participant may have started with pushups on their knees, which progressed to pushups on their toes, overall repetitions of burpees were increased, and/or sprints improved from 45 to 40 seconds. Resistance training included bodyweight exercises such as squats, push-ups, lunges, and planks. Aerobic exercise included exercises such as jumping jacks, sprints, jump rope, high knees, and mountain climbers. Resistance exercises aimed to increase strength and stability along with increasing heart rate and aerobic exercise aimed to increase heart rate. The session intensity was determined by RPE.Participants also accessed a study website that included descriptions of several different HIIT sessions. The website also included videos that demonstrated the HIIT exercises. Examples of exercises included push-ups, squat jumps, walking lunges, mountain climbers, hill sprints, plank, and jumping rope. Participants chose the type of moderate intensity PA they participated in each week. The goal was for participants to reach 70–85% of their maximum heart rate for the HIIT session with the high intensity components reaching 80–90%. The goal for the moderate sessions were 55–70% of maximum heart rate.