The purpose of this investigation was to provide an initial validation of a measure developed to assess psychobiosocial states in the physical education setting. The theoretical framework underlying the scale is the individual zones of optimal functioning (IZOF) model, a leading approach to the study of emotions in sport as well as in physical education. Findings provided support to the hypothesized factor structure, reliability, gender and age invariance, convergent validity, and construct validity of the scale.A limitation is that the paper reports an initial validation rather than a complete validation of a new measure. However, it should be considered that this is a new instrument that can have relevant research and applied impact in the physical education context, similarly to what is currently reported in the sport literature. On the other hand, the investigation has several strengths. These include the large sample size of 10 to 19-year-old students (i.e., more than 2,000) involved in a two-study investigation, the sound theoretical rationale, and the comprehensive analytic strategy to examine the data set.I found this two-study investigation well written and organized, the presentation clear, and data analyses appropriate to the study purposes. I agree that the study findings have the potential to stimulate further research on psychobiosocial states in physical education. I also agree with the limitations of the study that have been acknowledged and suggestions for additional research (e.g., further test of the convergent and construct validity, scale invariance, external validity). Thus, I have just a few notes that may help strengthen the paper:

I think future studies should also examine the validity of the scale in predicting the individual level of current involvement in physical education tasks, as well as the student intention to engage in physical activity and sport outside of school.

Moreover, the scale was used in a trait-like manner to gauge the student feelings usually experienced in physical education classes. A state-like version of the scale (i.e., “how you feel right now”) could provide useful information on current psychobiosocial states that can impact subsequent involvement in the activity and predict performance.

The reader may also benefit from a brief discussion of the difference with previous existing scales, such as the Positive and Negative Affect Schedule (PANAS).

Finally, the current investigation provides evidence of the validity of a measure to assess pleasant/functional and unpleasant/dysfunctional states as global dimensions. The PANAS is an example of another widely used scale for the assessment of global states (affect in this case). However, more detailed information can derive through the assessment of the single interactive modalities that form a psychobiosocial state. Additional research on this topic might be worth pursuing.

All these indications for future research might be considered in the final part of the paper.

P 14, L 39. Add a parenthesis after “(Bortoli et al., 2014, 2015, 2017)”.In my opinion, the methods are suitable, the results are well structured and clearly presented, and data interpretation is appropriate to the objectives of the study. After having carefully read the manuscript, I can say that I do not have any concerns regarding possible errors, and I think that the conclusions drawn from the studies are supported by the data.