Routine

[BIGA9905]

i usually spend about a hour four days a week lifting. each muscle group once a week  except abs. is this a common and effective routine. i know some people do some muscle groups twice a week. should i start

[iron_dawg]

i usually spend about a hour four days a week lifting. each muscle group once a week  except abs. is this a common and effective routine. i know some people do some muscle groups twice a week. should i start

you have to find what works best for you...i train a 3 on 1 off system and has always worked for me
sun-legs
mon-chest
tues-back
wed-off
thurs-shoulders
fri-bi's
sat-tri's
sun-off
repeat cycle

[jpm101]

Four days a week is a very common training style. If you do want to experiment, and try twice a week for a muscle group(s), than help yourself, your call. 

Most guy's will box themselves in with the idea of having to do so many workout in a weeks times.  Why that seems to be written in stone I do not know. Actually a training plan of 9 days, as opposed to 7 days (a week), can work so much better for a lot of guy's. Allowing more important time for recovery, growth and strength. Might consider that option. Good Luck.