I believe you'll develop speed via strength work which includes hill running, either repeats, or running hilly courses as the Kenyans do on a steady basis. ↗
During my 8 years as chairman, I had the privilege to peer into the future to see dynamic citizen astronauts returning to and from the heavens which we can expect in the future. ↗
I think DOOM had just the right mix of elements that keep people coming back to it: great monsters, excellent weapons with great balance, a spooky environment and extreme speed. ↗