According to our current understanding of physics, there is a limit to how fast objects with mass, such as humans, can travel without encountering significant relativistic effects. This limit is known as the speed of light in a vacuum, denoted by "c," which is approximately 299,792,458 meters per second.
As an object with mass approaches the speed of light, it experiences time dilation, length contraction, and an increase in relativistic mass. Time dilation means that time appears to pass more slowly for the moving object relative to a stationary observer. Length contraction refers to the contraction of the length of the moving object along its direction of motion. Relativistic mass refers to an increase in the mass of the object as its speed approaches the speed of light.
As an object approaches the speed of light, these effects become more pronounced, and the amount of energy required to accelerate the object further increases significantly. To accelerate an object with mass to the speed of light would require an infinite amount of energy, which is currently considered unattainable.
Therefore, based on our current understanding, it is not possible for humans or any other object with mass to travel at or exceed the speed of light without encountering significant relativistic effects.