endurance
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endurance
The ability to keep up a strenuous physical or mental activity over a long period of time without getting tired.
Ein Marathonlauf erfordert viel Training und Ausdauer.
Running a marathon requires a lot of training and endurance.
The word is made up of 'aus' and 'Dauer' (duration). It describes the ability to 'durchhalten' (to keep going / persevere) or 'aushalten' (to endure) an effort over a long duration.
Für diesen Job braucht man viel Geduld und Ausdauer.
For this job, you need a lot of patience and endurance.
'Ausdauer' is often used with the verbs 'haben' (to have), 'brauchen' (to need), 'zeigen' (to show), or 'beweisen' (to prove/demonstrate). Typical adjectives are 'große' (great), 'enorme' (enormous), or 'fehlende' (lacking) endurance.
Der Sportler bewies im Wettkampf große Ausdauer.
The athlete demonstrated great endurance in the competition.
As an abstract noun, 'Ausdauer' is used almost exclusively in the singular. A plural form ('die Ausdauern') is uncommon and is only used in very specific contexts.
Seine Ausdauer ist bewundernswert.
His endurance is admirable.
energy
'Energie' and 'Ausdauer' both have to do with the strength you need for an activity. 'Energie' refers more to the general physical or mental strength to be active or to start something. 'Ausdauer' refers especially to the ability to keep going for a long time without getting tired quickly. If someone has a lot of 'Energie', they seem lively and active. If someone has a lot of 'Ausdauer', they can continue a strenuous task for a long time.
Beim langen Lauf braucht man nicht nur schnelle Beine, sondern auch viel Ausdauer.
On a long run, you need not only fast legs but also a lot of endurance.
Nach dem Frühstück hatte Fiona genug Energie für den ganzen Kurs.
After breakfast, Fiona had enough energy for the whole course.