Tens of thousands of people gathered on the streets of London on Sunday to cheer on their friends and complete strangers during the hottest London Marathon ever. /VCG Photo

It is the hottest April in almost 70 years. The high temperature, around 23.3 C, failed to stop Mo Farah breaking the British record of 2 hours 6 minutes and 21 seconds. Even though running in the heat is awful, the crowd spurred them on. /VCG Photo

An officer for the St John’s ambulance said to The Guardian that more runners needed treatment this year than ever before. /VCG Phot

Warnings from organizations to deter participants from wearing costumes failed. Many participants dressed themselves up like bananas, trees or even rhinos. /VCG Photo