Our expert says:
OK, I'm back, sorry about the first one - sometimes that happens and I have no idea why.
OK, so here we go.
I think given your time constraints you have two options. One is to spread the training out, to split those 11 into days and then double the sets. I wouldn't change the speed of the reps - slower is actually better, it isolates the muscle better, whereas going fast gives one a way to 'cheat' using momentum! Adding sets means you obviously you have to split the session. A good split is stomach and arms one day, back and legs the next.
The other option is to simply increase the mass, or the reps, but keep the session the same otherwise. That would increase muscle mass gain. You could also increase the number of reps. Ididn't see how many you do on each currently, but 15 would be a good place to be. After that, increase the sets.
As you say, your progress so far is good - you just need to be patient and focus on being stronger and fitter!
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