OK to set possible goals in addition to the Impossible Goal?

My impossible goal is to earn the extra income to save for Life Coach Certification by the end of 2021. But I also want to pursue a goal of getting fit enough to complete 4 outdoor obstacle racing events this year. Even though this goal seems more possible than my first goal, it’s still a biggie and will require a lot of focus. My question- is it ok to set a few ‘possible’ but big goals in addition to the the impossible goal or is it better to practice constraint and just focus on the one impossible goal all year?