Well this answer is different for everyone. One size does not fit all on this subject. The first thing is to clearly identify your goals and structure your training specific to said goals. If your goal is to maintain health and function? A lower volume program is perfect. But, if you are looking to dramatically change body composition, add more advanced skills to your tool bag, or developing some serious strength gains the volume will most definitely need to increase.
Here is some great information from Beyond The WhiteBoard. These guys have been tracking workouts for years and have compiled some really interesting studies.
Working out 5 days per week week produced 27% faster improvement than 3 days per week.
After analyzing the data, we found that working out 5 days per week week produced 27% faster improvement than 3 days per week. Even increasing from 3 to 4 days per week is associated with 10% faster improvement. We’ve often heard people discount the value of only working out 2 days per week, but the data shows that those athletes only progressed 7.5% slower than their 3 day per week counterparts.
The real key here is consistency: If that means 2 days a week, 3 days a week or 5+ you are going to make some progress just be sure to align your training schedule with your goals, track your consistency and success will follow.
If you need some help creating goals and planning your training be sure to book time with one of the trainers at the gym. They have years of knowledge and are always happy to meet and discuss your individual plan.
Here is a link to the full article if you really want to Nerd Out on the numbers:
Working out More? Is it worth it?