Objective:
To pilot a multi-component intervention to sit less and move more, with (SLAMM+) and without (SLAMM) height-adjustable workstations, in contact centre call agents.

Methods:
Agents were individually randomised to SLAMM or SLAMM+ in this 10-month, parallel, open-label, pilot trial. Mixed-methods assessed response, recruitment, retention, attrition and completion rates, adverse effects, trial feasibility and acceptability, preliminary effectiveness on worktime sitting, and described secondary outcomes.

Results:
The participant recruitment rate, and randomisation, data collection and interventions were mostly acceptable. Refinements to organisation recruitment were identified. High staff turnover negatively impacted retention and completion rates. The multi-component intervention with height-adjustable workstations has potential to reduce sitting time at work.

Conclusions:
The demonstrated findings will help prepare for a future randomised controlled trial designed to assess the effect of the interventions.