Questionnaire

The questionnaire was structured for both conditions (Circle and Breeze) as follows:

Demographic questions.

Instruction video with questions regarding the intrinsic value, perceived effectiveness, and intention to engage.

The demographic questionnaire asked participants about, amongst other things, their age, gender, and their experience with relaxation and meditation techniques (Multimedia Appendix 5).

A questionnaire with the items listed in Table 1 was employed to measure the participants’ intrinsic value, perceived effectiveness, and intention to engage. Each item was rated on a 5-point Likert scale (1=strongly disagree and 5=strongly agree). Items I-IV were averaged to assess the intrinsic value, consisting of playfulness (items I-II) and aesthetics (items III-IV), and items V-X were averaged to assess the perceived effectiveness of both conditions.

Scale item wordings of each construct (intrinsic value, perceived effectiveness, and intention to engage).^a

^aCronbach α of each construct and both conditions Circle and Breeze are described to measure the internal consistency.

^bN/A: Not applicable, as the intention to engage only consists out of one item.

The items used in the questionnaire were based on existing questionnaires, items, and keywords [12,28].