I wasn't doing any working out in the before the before picture.
We have 3 types of muscle.
Type I ("slow twitch"): Activated at 0-60% of max strength levels. These are the smallest muscles fibres with little force output. Meant for endurance activities.
Type IIa: Activated at 20-75% of max strength levels. A mix of type I and type IIb. Fatigue resistant and have a high force output.
Type IIb ("fast twitch"): Activated at 60-85% of maximum strength levels. These are the largest fibres which cause the largest, most visible muscle growth (you want these to be big!). They produce most force, but fatigue quickly. When these fibres are in use, all the other muscle fibres will be recruited at the same time.
With that in mind, for mass gaining I'd use this rep scheme: 8-6-4-2. It goes like this: Choose a weight you can do for 8 reps - 3min break, increase weight so you can only do 6 reps max with it - then do 6 reps - 3min break, increase weight so you can only do 4 reps with it - then do 4 reps - 3min break, increase it to the heaviest weight you can do for 2 reps - then do your final 2 reps - 3min break till next exercise.
The 3 min break reduces you having to fight latic acid on your next set of reps. The low rep scheme specifically targets type IIb fibres. The program I bought really went into great detail about this and it did feel a little wierd doing something for only 2 reps. But results have been great so far and I'll have reached nearly 20lbs gained soon!
80% of your muscle gains will be with your diet. Most people who want to get stronger can put 100% effort in the gym, but finding someone with a good diet to back it up is much harder.
When you bench 15kgs are you doing it with dumbells or barbells?