Intervention
The participants in the IG performed the PEBs, which mainly consisted of juggling tasks, for 15–20 min twice a week for 12 weeks (24 sessions). The two sessions per week were conducted on non-consecutive days. After the training program was introduced to the participants by a sport scientist, they performed the PEBs on their own via online training videos. The videos always started with a short warm-up, which included mobilization exercises (~ 1 min). The participants then practiced the juggling exercises (~ 10–15 min). The difficulty of the juggling exercises increased from simple throwing and catching tasks with one or two different objects at the beginning to juggling exercises with three objects in the last weeks. The session ended with a relaxation exercise (~ 2–3 min). Once a week, the participants performed a balance task (~ 3 min) before the relaxation part. For further details of the intervention, see Scharf and Tilp (