(Image source: express.co.uk )
Though elephants are huge, this isn’t a barrier to the speed at which they run. Elephants are known to have good speed while running which is about 15 miles per hour.
Though elephants can run at a considerably good speed, they are incapable to jump. Due to the distribution of body mass in such a way that they need to balance it well.
image source:https://www.elephantnaturepark.org/ )
Because of this they aren’t able to have all four feet off the ground all at a same time.
Hence, this makes elephants the only animal which can’t jump.