Ok, if no one else wants to be specific, I will.
If you want to improve your GT fitness, you might build your workouts around the following exercises. I suggest youtubing each of them until you understand how they are performed right:
Deadlifts:Squats: Equally important in overall strength building. There is some overlap to the deadlift (so do not do these two on the same day) but with more thigh involvement. If your fighting technique is right, you use your legs a lot, so this exercise is indispensable.
Seated rows: Trains your lower back, upper back and biceps. This builds raw pulling power.
Pullovers (machine pullovers or dumbbell pullovers): Builds casting power, upper back and core strength.
Ab crunches: Good abs help stabilizing fight stance. Forget about sit-ups, they mainly train your hip flexors and is generally pretty useless. What you need to build a strong core is different variations of crunches.
Back extensions:
Other tips to improve GT fishing stamina:YOU NEED CASTING PRACTICE!: If you build a lot of strength with weight training, using that power to explosively cast huge lures will put you in a world of pain: You have the strength to basically rip your joints and ligaments apart. So strength training must be combined with lots of casting training.
Casting style:Fighting style:You do not always have to keep the rod tip up:Use a lumbar support belt:
Pick the right fight belt: Know your limitations: