My bench has been stuck at 225lbs for quite a while now. The main reason why I don't progress is because I could never finish 5 reps with 225lbs, usually only going 4 reps then eventually 3 reps in later sets. About a month ago I tried 1RM at 230lbs but couldn't even do a single rep. So I figured once I could hammer down 5 reps of 225lbs, I would be ready to try 230lbs for a 1RM again. Well, strange thing last night. I could only do 4 reps of 225lbs like typical but the first 2 reps felt pretty easy, just the last 2 felt like a struggle. I did 5 sets of 4 reps at 225lbs then just for the hell of it, I put on 230lbs. I did a single rep pretty easily. Shocked, I added another 5lbs and repped it easily again. I got a spotter and did 240lbs for 2 reps and last rep was assisted by my spotter. So... wtf. I don't understand the relationship between strength and rep endurance. Something feels wrong here. I can only rep 225lbs about 4-5 times before it feels like failure. For over a month I couldn't increase my weight even for a single rep then out of nowhere I can push 240lbs for 3 reps AFTER I completed 5 sets at 225lbs (making me more tired). It seems wrong. If I can do 240lbs for 3 reps, wouldn't I easily be able to do 225lbs for 5 reps? I see other guys do a 1RM at 240lbs then pump out 10 reps at 225lbs, but I just don't have the gas. What is going on, does my endurance just suck that bad?