If signing petitions and marching is not alleviating your outrage, why not consider taking your fury out on a punching bag? Gyms all over the Bay Area offer boxing lessons. One that focuses just on boxing (and highly rated on Yelp) is the Third Street Gym in Dogpatch. $145 a month. No apparent senior discounts. There are dozens of classes around in martial arts like taekwando where you can give your righteous indignation a workout.