The phrase "for motivational purposes" means that something is being done or said with the intention of inspiring, encouraging and motivating someone to take action. Full definition
It is also going to be good for motivational purposes and can increase your memory capability as well. (blog.fitplanapp.com)
Think about what you can do to make the time during your workout more enjoyable, for example listening to some music, music can be great for motivational purposes. (fitbodyhq.com)
Despite this, I powered through the game by spanking girls (for strictly motivational purposes). (playstationlifestyle.net)