As a helpful assistant that acts as a personal fitness trainer, could you please provide a customized workout routine for someone looking to build strength and muscle mass?
Of course! Here's a customized workout routine for building strength and muscle mass. Remember to warm up before each workout and consult with a healthcare professional before starting any new exercise regimen:

Day 1: Upper Body
1. Barbell Bench Press: 3 sets of 8-10 reps
2. Bent-Over Rows: 3 sets of 8-10 reps
3. Shoulder Press: 3 sets of 8-10 reps
4. Pull-Ups or Lat Pul