Ah, the Space Hopper!
Each hopper featured two handles on the top so you could keep your balance - but still many kids ended up flying right over these very handles after things got out of control! It really wasn't the safest toy around - its saving grace was its apparent inability to burst, although we had a good try at it. But it was great fun, especially when your mates lines up on theirs and you raced each other to the end of the playing field.
That's exactly how I broke my nose on a kerb stone, and still have the bump to prove it!