While the magnitude depends on writer, the Hulk's strength is generally believed to increase with his rage. However, if Banner should decide to increase his strength, would this have an effect on the Hulk's baseline strength?
Probably not. The Hulk's physical power has little to do with the physical strength of Bruce Banner, and more to do with the manifestation of his psychological dysfunction of anger and rage. It is rage which powers the Hulk, so the angrier Banner is, the more powerful the Hulk's will be physically.
Since Banner's physical strength is so minuscule in comparison to the Hulk, it is unlikely improving Banner's physical strength would do anything to augment the Hulk's already almost limitless reservoirs of physical strength.
The Hulk possesses the potential for limitless physical strength depending directly on his emotional state, particularly his anger. This has been reflected in the repeated comment, "The madder Hulk gets, the stronger Hulk gets." After probing, the entity Beyonder once claimed that the Hulk's potential strength had "no finite element inside."
Hulk's strength has been depicted as sometimes limited by Banner's subconscious influence; when Jean Grey psionically "shut Banner off", Hulk became strong enough to to overpower and destroy the physical form of the villain Onslaught.
Writer Greg Pak described the Worldbreaker Hulk shown during World War Hulk as having a level of physical power where "Hulk was stronger than any mortal—and most immortals—who ever walked the Earth."
His durability, regeneration, and endurance also increase in proportion to his temper. Hulk is resistant to injury or damage, though the degree to which varies between interpretations, but he has withstood the equivalent of solar temperatures, nuclear explosions, and planet-shattering impacts. - Hulk > Wikipedia