Work On Your Mobility!
There's a lot more to training than just walking in the gym and benching 225 or squatting 315. Sure, lifting heavy is fun and all, but for how long do you think you can keep it up? At some point your body starts taxing you for the amount of stress you're putting into it.
This is why flexibility and mobility are so important, they play a huge roll in overall health and fitness performance.
Bodybuilding is something you want to do the rest of your life, this is not a short term goal. So knowing how to structure your training to include mobility, flexibility, intensity and recovery is what's going to determine whether or not you can do this for the years to come.
There are many different ways of performing mobility and including it into your program. Use youtube or Google and look for different examples and start including them into your daily routine until you find what works best for you. My recommendation: Start every workout with a 5-10 minute cardio to warm up followed by 10 to 20 minutes of mobility work and end your strength training with 10 to 20 minutes of stretching. If you do this consistently you will notice how much your overall training program will improve and also help you avoid injury as much as possible.
Thank you for reading! If you have any questions, leave a comment below.