Answer: this question is opinionated so I'm just winging it for you-
I would not mind because I don't really want to have kids. If they were upset about it and it was affecting their mental health, I would then in that case feel empathy towards their pain and support them the best I could.
Training too many times a week and not letting your body rest.
Both Kyla and Tia will be in their zone. Even if they dicrease their heart rates by 20 beats per minute from 175 beats per minute. 155 beats per minute still falls under kyla's target heart rate zone and Tia's target heart rate zone.
C. that contains nicotine and carbon dioxide