der Elan
vigor
A feeling of energy, enthusiasm, and inner drive with which one begins or carries out a task or activity.
Mit großem Elan machte sich das Team an die neue Herausforderung.
The team tackled the new challenge with great vigor.

vigor
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vigor
A feeling of energy, enthusiasm, and inner drive with which one begins or carries out a task or activity.
Mit großem Elan machte sich das Team an die neue Herausforderung.
The team tackled the new challenge with great vigor.

'Elan' (vigor) is very often used in fixed expressions with prepositions. Especially typical are 'mit Elan' (with vigor), 'mit großem Elan' (with great vigor), or 'voller Elan' (full of vigor).
Die Studenten gingen voller Elan an das neue Projekt.
The students tackled the new project full of vigor.
Common verbs used in connection with 'Elan' (vigor) describe the loss or presence of energy. Typical phrases are 'den Elan verlieren' (to lose one's vigor) or 'neuen Elan finden' (to find new vigor).
Nach der langen Pause war es schwer, den Elan wiederzufinden.
After the long break, it was hard to find that vigor again.
'Elan' (vigor) is a positive and dynamic word from French. It is often used to describe the momentum and enthusiasm at the beginning of an activity and sounds somewhat more elevated than 'Energie' (energy).
Mit jugendlichem Elan startete sie ihr eigenes Unternehmen.
With youthful vigor, she started her own company.
energy
'Energie' and 'Elan' can both describe someone being active and full of strength. 'Energie' is more neutral and generally refers to physical or mental strength. 'Elan' puts more emphasis on enthusiasm, momentum, and the desire to do something. So you are more likely to say 'Energie' when someone is not tired. 'Elan' fits especially well when someone approaches a task with motivation and joy.

Herr Wagner hat das neue Projekt am Montag mit großem Elan begonnen.
Mr. Wagner started the new project on Monday with great vigor.
Nach einer kurzen Pause hatte das Team wieder Energie für die nächste Aufgabe.
After a short break, the team had energy again for the next task.