The best replacement for marathon is boulevard.

The best alternatives to marathon are rated as following:
★★★★★  boulevard
★★★★  roundabout
★★★  half marathon
★★  sprint
★  key west
★  advocate
★  sprinter
★  triathlon
★  britax boulevard
★  key largo
★  agility
★  10k
★  decathlon
★  pavilion britax
★  century
★  islamorada
★  olimpia
★  doom
  hacker
  motagua
  5k
  real espana
  chicco nextfit
  luminox
  britax roundabout
  ultramarathon
  boulevard britax
  pavilion
  st. augustine grass
  graco my ride
  full marathon
  half ironman
  saprissa
  marathon
  britax advocate
  nautilus
  ironman
  wet okole
  aurora
  new york marathon
  combat endurance
  sunshine kids radian
  wizard
  tall fescue
  britax frontier

Your alternative for marathon is not listed? Suggest!
Speaking about marathon, one probably shouldn't forget about qualifying.

Other search terms related to marathon and their ratings are:
★★★★★ qualifying
You have in mind a companion for marathon and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of marathon in all years. Click on graph for more.
marathon
boulevard
roundabout