meron pala ditong nag-i-increase ng weight kasi hindi na sumasakit. ibig sabihin, nag-plateau ka na. kahit mag-increase ka ng weight, its not going to do anything. you might hurt yourself in the process.
there's this technique that arnold schwarzenegger did. its called the slow grind (that's what I call it anyway). di ba ang normal mong ginagawa ninyo sa leg press eh one swift motion to press, then push it up right away. hindi nai-strain ang muscles that way. let the weight push down your legs, slowly, then pause for 2 seconds, then push it up slowly again, feeling the weight, say start with 'your weight + 50 lbs.'.
ex: you weigh 170 add 50 lbs. = 220 lbs. do 12 reps, 5 sets.
Its not how heavy you can lift or push, its the way you do it.
@panterica - you can't do it your way either, hehe. can't change the right form, there are other exercises for those parts. if you do that it will screw up how your muscles will form.
