i was doing 20 of each before i started on the machine stuff, i was getting 10 reps out of each but then it was the point of hitting the physical wall
then i had a bit of a brainwave and tried to give myself 5 minutes rest between sets and that's been fine and dandy and i've been able to get 10 wihtout fading to nothing because before i was only giving myself a minute or so before getting onto the next set, just like i was doing when i was doing press up and squats with my own bodyweight
i can't lift too heavy a weight though as my knees are shot, as is my back and both shoulders, and after a while my left wrist starts to hurt where i broke it about 10 years ago so i really can't go any heavier
i have been eating a lot more though, not because i've been eating more to give me more energy, but because i'm a lot hungrier