Not gona bullshit you, I don't cycle my pre workouts dranks. I just make sure that's the only caffeine I consume that day to make damn sure I get good sleep. So I sacrifice my precious cup of coffee at work. And on my off days no more than 2 cups of the good stuffs. Every few months I feel over stimmed I cut all of ot out for a few days and for me that reboots me.

It's best to cycle your pre workout supplements to maintain effectiveness and proper utilisation.

Take them on their highest intensity sessions. Or taken them on the days where you need the boost and don't take again for the rest of the week, otherwise your body becomes insensitive to the ingredients and the effects for which your paying for (mental focus, muscle pump, muscle endurance, increased stamina etc) and then you begin to slide down the scale of its use.

It's like smoking (if you've ever smoked, and I don't condone it either lol). Your first ever cigarette is the strongest because your body is like woah shit what is this stuff. It intensifies due to the natural insensitivity to the ingredients. It's the same with pre workout supps. Caffeine, ephedrine, L-Arginine, AAKG, taurine etc. Most of these ingredients are heavily reliant on the sensitivity of the person taking them.

If you drink loads of coffee a day, and loads of energy drinks. Your insensitivity, just like the smoking example, is going to be much lower than someone who doesn't use the product that often and therefore, the body readjusts and receptors become more prone to the uptake.

Cycle once or twice a week. When your doing really heavy reps, heavy sets and killing it in the gym. Use it then. Otherwise keep it stashed away, for the next time around.

What will burn muscle, working out 2X a day or your pre-workout?