I had to google both because I am unfamiliar with the names. I use BCAA's during before, during and after training as well as some times two more times through out the day to help prevent muscle atrophy. I train in 10am.
I'm starting a ostarine and s4 cycle in feb. Hst isn't really an ideal program to use while your on sarms, but if you do, remove the 15 rep and deconditioning phases, and increase the volume