Strength Training that Compliments Swimming
My number one fitness goal right now is to become a stronger, faster swimmer while avoiding injury. I have access to coached swimming practices, but I know weight training is also an important part of reaching my goal. Unfortunately, when I research weight routines for swimmers, they include quite a few exercises I am physically incapable of doing due to a mobility issue/chronic pain in my foot that keeps me from weight-bearing exercise while standing. I can't even carry free weights to a bench so I can do free-weight presses. I am completely reliant on machines that do not engage or put weight on my foot. That means no squats or leg presses, unfortunately.
I feel like my routine as is, which is somewhat haphazard, does not engage my core enough. My back and arms are getting stronger, as are my hamstrings, but my theory is that my abs are lagging behind because all of my exercises are seated. I'm going to add planks to my routine to try and balance my back and ab gains a bit, but I am in need of other ab-strengthening ideas.
Beyond that, I am open to any suggestions. If there's any exercise at all -- with or without a machine -- you can think of that is good for a swimmer to practice and doesn't involve standing or pushing with the feet, I would love your suggestions as I put together a more thoughtful weight routine.
Thanks for your time.