Work rate
Part of what makes Atletico Madrid such an excellent side under Diego Simeone is the work of fitness coach Oscar Ortega in between matches.
Atleti are perhaps the hardest working team in Europe, and Diego Costa performs an extraordinary job at the top of the attack, pressing goalkeepers, defenders and dropping back to play a midfield role when he is eventually bypassed.
The ability to panic opposition players in possession could prove hugely useful for Chelsea next season with Costa in the squad.