Question: which sports are most physically demanding?
Answer: 1 – Boxing. Anyone who has ever spent even just a few minutes jabbing a punching bag can tell you how exhausting boxing is.
2 – Cycling. Think a marathon is long? ... 
3 – Mixed martial arts (MMA) ... 
4 – Water polo. ... 
5 – Rowing. ... 
6 – Gymnastics. ... 
7 – Rugby. ... 
8 – Mountaineering. ...