Source: https://www.irishtimes.com/sport/other-sports/one-giant-leap-too-far-why-mo-farah-can-t-win-the-london-marathon-1.3468820?mode=sample&auth-failed=1&pw-origin=https%3A%2F%2Fwww.irishtimes.com%2Fsport%2Fother-sports%2Fone-giant-leap-too-far-why-mo-farah-can-t-win-the-london-marathon-1.3468820