A knight in his twenties or thirties are likely to have been in similar physical shape as a professional athlete today. Knights that were a bit older were sometimes in good or even great shape and sometimes not. It varied significantly, because knighthood was as much a social distinction as a military one.
How did knights keep fit?
A knight or soldier may spar, and do physical training like trail-running, lifting stones, or wrestling to prepare for battle. Some Knights lived for organized fights like jousts, and gladiator-like sparring arena fights. ... Tradesmen's work was typically their exercise.
How healthy were medieval knights?
It is not surprising that health during the Medieval times was poor and the mortality rates following illnesses were high. ... Knights and soldiers suffered from various health problems such as broken bones, wounds, abscesses and fractures. These were treated in unsanitary environments making the condition even worse.