[1] His brother Frederik Arnoldsen is also a handball player for Skanderborg Aarhus Håndbold.

Arnoldsen started playing handball at his hometown club Skanderborg Aarhus Håndbold.

[2] In 2023 he transferred to the Danish top team Aalborg Håndbold.

He debuted for the Danish national team on March 9th 2023 in a 30:23 win against Germany, where he scored 7 goals.

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