Can you get physically stronger by improving ki power? Being able to move faster without flight looks like physical strength. They're unable to fly, so they're using a stronger physical push off the ground. Being able to dodge twice as fast means they're physically moving faster. Or are they using ki to propel themselves (but not uniformly enough to fly), rather than using it to strengthen their muscular contraction?
There's also Yamcha lifting ridiculous amounts of weight in the gym. Isn't this strength?
In the other direction you can definitely improve ki by improving strength. Roshi's training all looked like physical strength training.
Why do Vegeta and Goku do pushups in gravity? Isn't that physical strength training? Goku did 100G weight training and his ki power drastically improved. That makes it seem like ki power and physical strength are at least paired together, if they aren't the same thing.
I'm also thinking ki could be needed for strength only over a certain threshold, which is probably the threshold of a being's physical limits. So a human can reach a PL of 5 or so without unlocking ki, but needs ki to achieve strength feats beyond that.
For Roshi and the wall, it could be either 1. Active ki use is proportional to strength and he wasn't using the necessary ki, causing him to be physically weak. 2. They're not proportional.
For 1. the problem is he then uses a powerful kamehameha. However, he needed to go buff for it (just to destroy a little mountain, when later he could destroy the moon) and then has no ki power remaining immediately afterwards. So it could be he didn't have access to ki while not buff, or that he was saving his ki for the kamehameha and relying on only his muscles without ki to get over the wall.
For 2. it can be true looking at Roshi, but then doesn't hold up when looking at the later training methods of Krillin, Goku and Vegeta.
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