Some months ago, I started performing semi-regular press-ups with the intention of building a bit of upper-body strength, endurance and tone. I'm 39 years old, and male.
I've been doing three sets, with a thirty second break between each, and a "set" basically comprising performing repetitions until I feel I physically can't manage any more. I've been managing to do this a minimum of every other day, but frequently I can do it more often.
At first I managed to push out sets of about 2-2-1. That increased very rapidly at first, adding a total of 3-4 repetitions to the total every week that passed, then the rate of improvement began to slow, which is to be expected
As it stands I can manage sets of about 15-4-2. But I've been stuck at around that level for weeks now, with only tiny, incremental improvements which often don't last (i.e. I manage an extra rep one day, and lose it the next).
Is there anything I can do to improve the rate at which I'm gaining strength? I want to keep this relatively informal: so no special diet or gym membership or anything like that. But should I being doing my little routine more or less often? Increasing the break between sets? Doing more sets? Or given my thin, wiry physique, am I simply reaching my physical limit without much more intensive training?