Endomondo challenges

January chanllenge: https://www.endomondo.com/challenges/19599383.4
February challenge: https://www.endomondo.com/challenges/20015238
March challenge: https://www.endomondo.com/challenges/20607070
April challenge: https://www.endomondo.com/challenges/21281256
May challenge: https://www.endomondo.com/challenges/22008078
June challenge: https://www.endomondo.com/challenges/22732309
July challenge:
August challenge:
September challenge:
October challenge:
November challenge:
December challenge: