How to get a tan help please?

first of all im spanish i'm half spaniard/ half colombian therefore my natural skin color should be olive however ever since i move to the usa my pigmentation has change since and now im white as a ghost the problem is that now everytime i go to the beach i burn instead of tanning wat can i do to change this because i would really like to get my natural skin color also i use spf 50 im think about just going running or playing soccer without a shirt for like an hor everyday instead of just laying down in the ocean