It's Hot or Not time again as Sportsmail's Riath Al-Samarrai reveals what's been making him feel warm and what's been leaving him cold this week.
HOT
Elliot Giles
As of this week the Brit holds the second fastest time in history for 800m indoors — an astonishing performance. But is he the second best 800m runner in history? No. Close? No. And that is why World Athletics have messed up, because they meekly allowed so many leaps in spike technology that no one can identify a good or great time any more. A muddled sport.