Like athletes and dancers, artists need to stretch and warm up every day.
Often people find it daunting to mark good paper, and so I suggest that newspaper, wrapping paper or inexpensive wallpaper lining be used.
In this one minute video I use watercolour and designer gouache on newspaper. The key is to just doodle until you relax.
Better to do an exercise like this for fifteen minutes a day, than to have painting marathons once a month! Have fun.