Taking a hit, or two, before a workout will not give a great workout and tons of energy. And just the extreme opposite of a mind-body (very overworked term) connection. Unless you lace it with with PCP (any form), which will make your super strong for a short period. But rather than working out you may prefer to fight, rip your eyes out or other strange stuff, which is not all that cool.
Uppers (higher grade or speed?) may attack the CNS way too much for a productive workout. You can lose focus because you have to do a 100 things at the same time, in your deranged state, and working out will not be of prime importance. Mild uppers (street or legal) could help direct focus. Some can be brought OTC. Good Luck.