Strength training

[jaxbeachgator]

After several years focusing on crossfit type training I have found myself enjoying getting back into your classic gym for weight training. Any suggestions on amount of reps/sets of exercises to increase strength. Historically, I've always been following the 3 set/ 10 rep type of regimen. However, I realize that may be somewhat out of date. Can't help it but I always fell compelled to work the core each workout.