Robert Arrhenius

Aarhenius debuted as a senior player for IFK Skövde HK in the Elitserien. In 2000 he joined Spanish side CB Cantabria. In 2003 he moved to Germany and joined HSG Nordhorn in the Bundesliga. Here he reached the semi-finals of the EHF Cup Winners' Cup, where they lost to eventual winners, Russian Chekhovskiye Medvedi.

He then returned to Spain to join BM Aragón. In December 2010 he joined German side THW Kiel for a mere 4 weeks on a loan to replace Marcus Ahlm, who had been injured. Afterwards he returned to BM Aragón for the rest of the season.^[2][3] He got to play 7 matches for the team.^[4]

In the summer 2011 Arrhenius joined Danish side Bjerringbro-Silkeborg, after BM Aragón had gotten into financial trouble and had to release him of his contract.^[5] After a year in Denmark he had his contract at BSH cancelled at his request due to familial reasons.^[6] He then returned to Sweden again to join his old club IFK Skövde HK. At the beginning of the 2013–14 season, he became a player-coach at the club under Peter Johansson.^[7] He retired at the end of the season, and continued as a coach.^[8]

In 2018 he made a short comeback for the Spanish Mallorca-based club Handbol Marratxí together with Magnus Jernemyr.^[9]

In 2019 he became the assistant coach of the Egyptian club al Ahly SC under Ola Lindgren.^[10] In 2021 he returned once again to IFK Skövde HK to become the technical coach at the club, specialising in coaching the centre backs.^[11] From the 2023–24 season he was promoted to assistant coach.^[12]