This study aimed to analyse the effect of 12-week low-volume HIIT-based concurrent training programme on body composition, upper- and lower-body muscle strength, mobility and balance in older adults, as well as to compare it with a low- moderate-intensity continuous training. 90 active older adults were randomly assigned to experimental (EG, n=47), and control (CG, n=43) groups. Body composition and physical functioning were assessed before (pre-test) and after (post-test) a 12-week intervention. A 2-way repeated measures ANOVA was used to test for an interaction between training programme and groups. The time x group interaction revealed no significant between-group differences at pre-test (p≥0.05). The group x time interaction showed significant improvements for the EG in body composition parameters (p<0.05) and physical functioning (muscle strength: p<0.001; mobility: p<0.001; and balance: p<0.05); while the CG remained unchanged (p≥0.05). This HIIT-based concurrent training programme led to greater improvements in body composition, muscle strength, mobility and balance in healthy older people than a regular low- moderate-intensity continuous training, despite the reduction in overall training volume.