• ≥18 years old

• Fulfilment of the 1982 American College of Rheumatology (ACR) criteria; or 2012 Systemic Lupus International Collaborating Clinics (SLICC/ACR-Damage Index (DI)) classification criteria; or EULAR/ACR criteria; or patients that have received the diagnosis SLE on clinical grounds

• Low to moderate disease activity, for example defined as a score of ≤5 in the clinical version of the SLE Disease Activity Index 2000 (SLEDAI-2K), i.e., excluding the serological descriptors (anti-dsDNA positivity and low complement levels)

• Low/minimal or no organ damage, for example defined as a score of ≤3 in the SLICC/ACR DI

• Stable pharmacological treatment

• The ability to perform a maximal ergometercycle exercise test

• Be able to read and understand Swedish