I'm just going to list all weight/gravity training the characters did through out the story just to hopefully people can see there aren't inconsistencies:
- Goku and Krillin trained with a forty kg turtle shell to overcome the ordinary human level;
- Goku trained with an over one hundred kg suit to match Piccolo's power;
- The Saiyans are used to ten times the gravity of the Earth;
- Goku trained under ten times the gravity of the Earth to match the Saiyan's strength;
- Goku trained under one hundred times the gravity of the Earth to overcome the Saiyans' limits;
- Vegeta trained under three hundred times the gravity of the Earth to overcome his limits and become a Super Saiyan;
- Nobody complains about ten times the gravity of the Earth inside the RoSaT, not even Gohan;
- Goku later trained with weights of eight tons without too much effort and with weights of forty tons while in the air which roughly equals training in six hundred times the gravity of the Earth. He cannot move while in the air with those, unless he goes Super Saiyan;
- Vegeta later can freely move in one hundred and fifty times the gravity of the Earth in Super Saiyan. Trunks barely can handle that same gravity unless he goes Super Saiyan;
- Pui Pui can handle tens times the gravity of the Earth, thinks that is impressive and Vegeta just dances in hip-hop style in front of him;
- I think that is all. I honestly can't see where the inconsistencies are.
Piccolo Daimao wrote:Even though Yamcha's clearly much stronger than Goku was when he first landed on Kaio's planet, he still mentions that he can barely stand the gravity, because he isn't used to it.
Honestly that only proves Yamcha is still not strong enough to handle ten times the gravity of the Earth just like Goku wasn't strong enough either. Just because Goku is stronger than Vegeta does that mean he can automatically beat Freeza? I believe not.