new schedule routine...help
 

For just under a year I have been on maternity leave and my mom has come to watch my kiddies while I would go to the gym. My schedule was this:
Monday, tuesday, thursday friday...I would rotate a three day split (with 20-30 minuties of cardio after weights)..legs/shoulders, back/biceps, chest/triceps...I lift heavy weights.

Well now I am going back to work :( and I still want to keep up my workouts but I do not have quite the same time to commit. I am looking at doing upper body on Monday's, Wednesdays a Force class which is wieght training in an arobics studio (working on muscle endurance) and then lower body/shoulder maybe on Fridays and then another force class on Sunday. I am having a hard time convincing myself that I can still build muscle without working out the same way I am currently working out.....any thoughts....also it would mean no rest day between sunday and monday...is this a problem? I also plan to fit in cardio when I can (ie getting up before work and using the treadmill at home)

thanks in advance for your help:)