How to Make Progress as an Advanced Lifter, Activation Exercises and Pre-workout Nutrition [Q&A]

I have a question for you and Derek about personal training certifications. I am currently in a master's program for Exercise science and working in the field in a clinical setting, but I want to get a personal training certification so I could potentially do that as a side job as I notice that a lot of gyms/studios require it. However, there are so many out there and I'm unsure which one to invest money in. I am curious which ones you and Derek have and why you chose those certs. I really just do not want to waste money on the wrong one!

What are your thoughts on activation exercises? Are they worth it or a waste of time?

Hey Kyle, like yourself, I have been training for close to 20 years. I'm now in my mid 30s and wondering if I have built all of the muscle I will in my lifetime? I still love training so it's not like I am going to stop. But, I guess my question is, what can I do to continue making gains as an advanced lifter? Or, is it not possible?

I train early in the morning and typically train fasted. I enjoy training on an empty stomach but wonder if I should try to eat something before training? I have time so that is not a factor.

Hi guys, I am traveling for most of December and my training time will be very limited. I'm worried about losing muscle and strength. One, should I be concerned? Two, if I do lose muscle and strength, how long will it take for me to gain it back?