Prohormone that wont kill cardio (and will build strength)

[Jpickcf15]

I do Crossfit and am looking for something that will enable me to add strength while not hurting my cardio. Most of our workouts are 20 min or less and focus on explosiveness, endurance, etc. Any help is appreciated.

 

[stespiel]

I know this thread is old so you probably found answers elsewhere.. But I think you want to look into a sarm like ostarine.