I will read in my free time. Reading can cultivate my sentiment and increase knowledge, so I can use my free time to read more.
This is the typical Time Killing of Younger generation , though I consider Reading is a production things yet actual or physical thing is more productivity for me,Free time is definitely to relax and rest to relieve the fatigue of work. I usually lie on the bed and play with my mobile phone. 
gaming? what if you lose? then the mood will change and stress will come?