agree w one-niner.. I would recommend using the LAT pulldown
machine in the gym for those who can't do chinups yet. Cos its
specfic (ie train the exact muscles used for chinups) and
progressive (you can start with lighter weights and slowly
strengthen as you go along)
Do about 3 sets of 10 pulldowns at about 80% of your max,
everyday.. increase after a couple of days. initially, u'll feel
the strain in your muscles but once you get used to it, then it'll
be ok.
If no gym ard, doing Flex arm hang is also ok.. hang for 8-10 sec,
do 5-8 sets..
For me, when i started training for pullups, I din care about the
technique... I swing, i kick, i cycle in mid air.. No matter how
ugly i look, die die also will do 5. eventually the muscles start
to strengthen.. then I realise that i can do 5 without swinging...
after that then I start to concentrate on the proper technique.