Weight Training - few days in a row?

AleenaRose83

I recently joined a gym with a few determined co-workers and we absolutely LOVE it! This gym offers a variety of classes, one being a strength training class. After speaking with an instructor, she recommended we do the strength training class (which includes the use of free weights) twice a week, and cardio 3 times a week at the minimum. The problem is, the only strength training classes I can make are Thursday and Friday. I have gotten some mixed advice, while majority say it is VERY important to have a rest day between strength training, others say it's not that big of a deal.

What are your thoughts? Because the only two days I can make the strength training classes are back to back, would it be harmful or less effective if I did both days in a row? How important is a rest day?

Any thoughts would help, thank you!