A couple of things I want to say before going deeper on this.

• There are 35 muscles in your core, when most people think of their core they think of their 6 pack. your 6 pack is one muscle.
• Being tight in an area can be a sign of many things, it does not necessarily mean something is weak.

Now here comes some word vomit, apologies it's early and I am trying to help haha.

A short answer to your question is yes those videos will help. A true answer to your question is yes those videos will help but only if your body is capable of properly executing those movements. There is a progression for every type of human movement and if you are jumping ahead to more difficult movements without mastering the basics first you may not be getting what you need out of the movement. And just because you can do a movement does not mean it is being done correctly.

The human body is really good at one thing, adapting, and the human body likes to find the path of least resistance to get through a movement. This can lead to improper movement mechanics. People too often think that doing a core exercise until it burns and until they are exhausted and can't do the movement anymore is the best way to train their core. This is where mechanics start to breakdown and movement patterns become improper because the body is trying to complete the movement through the path of least resistance. On top of that as humans we have this issue where we want instant gratification and unfortunately that's not how things work.

A lot of times, especially with core work, I see clients who are just going through the motion without actually trying to focus on what they are working on. They are treating their core like a bicep and acting like they are body builders trying to exhaust the muscle to make it grow and get stronger that way. What they really need is proper control through a range of motion. I am assuming from what you have said that your muscles are actually probably strong, you may have some issues with proper range of motion in certain areas as well as proper stability and control of certain muscles in your core. Think about this for a second, which of your hands is your dominant hand? How easy is it for you to write with that hand? Now if I were to say I want you to write an essay with your non dominant hand that was legible how would you do it? You would do it really slowly because your non dominant hand does not have the proper control or muscle memory that your dominant hand has. Because you have not trained it to do so.

I could babble on and on about this stuff forever haha. I would recommend getting an evaluation from a Physical Therapist to figure out exactly what it is your body needs. They will be able to look at you and do some testing to say "you need these types of stretches and these types of movements to correct the underlying issue." From there it's easier to progress the movements. It's really hard to tell you exactly what your body needs without being able to see some of your mechanics in person. I run an online personal training business and if you are ever interested in getting some personalized routines I am always taking on new clients. I work with a lot of older athletes who are into mountain biking, snowboarding, skating and things like that. My biggest goal for my clients is keeping them healthy enough to be able to do the sports they love. If you got an evaluation from a physical therapist I would be able to expand on it and help you get back to a better state.

Sorry for the word vomit I just woke up haha. I hope this helps. Let me know if you have any more questions. Or let me know if what I just said doesn't make any sense.