I've been hitting my local gym 6 or 7 years running. I usually go 3 times a week, but in "strong" periods I can go 5 or 6 times a week. This is not often though. It is important to make sure your muscles are not overexposed as this will have a katabol effect, as opposed to anabol. (anabol means growing stronger, katabol is actually growing weaker due to overstraining. May result in muscle damage)
I usually work out alone, as I find the single workout more effective, less dead time more lifting. Of course, if youre having trouble motivating yourself, consider working out with a buddy, you can push, support and motivate oneanother.
Another tip is to change your exercise prog every couple of months! If you grow bored with your exercises, change them! Also your body benefits from not repeating the same movements over and over.
Third, combine cardio with strength training for optimal calorie burn!
Compose your diet to go with your exercise, this will boost your performance and your gain, and in turn your motivation!
Keep an exercise log to monitor your gain.
join a forum for positive feedback, to discuss diet and get tips for workoutprogs.
Talk to staff at your gym, consider personal trainer! These should be able to guide you, motivate you and compose a workout- and dietprogram for you!
Try to focus on the positives of training, health benefits, how good you will look come summer, how good youll feel about yourself, staying fit and healty for your loved ones.... Pick your motivator!
Remember, keeping fit is a lifestyle not a every-now-and-then thing!
Good luck!
-Daniel-