10 mg pre-workout only is NOT going to provide you with what you are looking for. Like all steroids, you need to maintain levels for an extended period of time in order to experience its full effects. For example, if you could inject 400 mg of test cyp, but you aren't going to feel much of shit an hour later. Guys who have a lot of experience with test can usually feel a slight change after short period of time, as they recognize its effects more easily than someone with less experience, but its effects will be much more pronounced after using 400 mg/week for 3-4 weeks.
It is the same with Halotestin. Yyou need to use it every day, 2X daily, for at least a week before it will provide fill benefuys...and some guys will need to use it for a couple weeks before it has kicked in fully. Halo's half-life is about 9.5 hours, so by taking it only 4-5X weekly before wokrouts, the halo will be active for no more than 38-47.5 hours per week! That is only 1.5-2 days a week. How well do you think test would work to increase libido, energy, and intensity if it was only active 1.5-2 days weekly? Not very well. So, why do you think Halo will be any different?
The bottom line is you will only experience afraction of Halo's effects by taking it pre-workout. You should take it 2X daily, in equally divided doses, for at least a few weeks. As for dosing, 20-40 mg daily is normaly, although at halo's price, 40 mg will cost quite a bit. 20 mg still works very well and will cost lot less. As long as you take one dose as soon as you wake up and your 2nd dose 8-9 hours later, you do NOT have to take it right before your workout because it will be in your susyem the entire time you are awake. Taking it right before your workout does not do anything magical...all that matters is that the drug is still in your system since the previous dose. It will affect you just as strongly 1 hour after you take as it will 8 hours after you take it. It is either active or it isn't...there is no inbetween.