So I understand that the foundation series is successful because it allows you to train multiple skills in one session and progress using proper preparation. But what I'm about to ask has no intention of insulting anyone: is it counterproductive to focus on two skills (i.e. front lever and planche) at a time; and incorporate the other movements later when you master those two first?
I'm asking because I was thinking about build your skills "brick by brick", meaning focus on a few skills at a time. If I just focused my time on those two instead of the others, would the result be an increase in progress (using coach's progressions of course) or potentially hazardous? What if I added the SLS, making that three skills to invest my time on? Do you guys believe it's a waste of money? I apologize if this sounds ignorant or out-right audaciously stupid. I just want your guy's opinion on this and any advice is most appreciated.