If your reps to failure is 10 then do 4 reps five times a day. So no sets to failure. After a couple of weeks increase to 5 reps - and so on. I have seen it modified to 4 days a week rather than every day.
Got it. Thanks Mike. So it's 40% of whatever your max (failure) rep number is, repeated 5 times a day.
So my best no. of reps for press-ups is about 32-34. 40% is about 12-13 press-ups. So 5 sets of 12-13 press-up reps each day. I'll give it a go.