(Hello I just need name, no explanation)In a research article, " yoga "- the yoga poses and effects on heart rate, had a study where 50 participants (both male and female) were randomly chosen to do...

(Hello I just need name, no explanation)In a research article, " yoga "- the yoga poses and effects on heart rate,  had a study where 50 participants  (both male and female) were randomly chosen to  do either low intensity yoga poses or high intensity yoga poses for 5 minutes.After that ,each participant was given 10 dollars and told that they could keep the money or roll a dil for a  double amount or nothing.  Of thr 30 participants who did low intensity poses, 20 took the bet.

Now, the researchers want to know that are the perole who did high intensity poses more likely to take risks ( taking the bet) compared to the ones who took low intensity poses

1  is it observational study or experimental study

2 name the observational units.