Dont bother with the machines. there a waste of your time. Instead focus on big compund movements which require the use of stabaliser muscles, these are eliminated in machine's because the path of the weight is pre determined. Bench, Squat and Dead lift. Aim to Increase your IIb type (fast twitch) muscle. Your workout should not exceed an hour, after this well... cortisol is produced leading to a catabolic state. This is not ideal if you want to gain. PS: EAT MORE