inject 10iu before training on empty stomach and tell me you dont go hypo from that...
i did that once with 6 or 7iu... just let me tell you i honestly think i nearly died and its IMPOSSIBLE to complete a workout on that
youll go hypo from the slightest activitity on 5iu+, just jacking off will make you go near coma
if your blood sugar is otherwise stable (you sit on your ass) then 5 or even 10iu will make you feel like shit but you wont drop
add in a workout or some activity and its a whole different ballgame
lantus use is also completely retarded. its quick gains for a huge price, because it causes insulin resistance within days of use, there are even studies on that