Table 5. Within-group change and mixed-effects results in the self-perceived fitness questionnaire.
HIFT1 (n=3) HIFT2 (n=7) HIFT3 (n=9) Mixed-Effects
Pre
M (SD)		 Post
M (SD)		 Cohen’s d
[95% CI]		 Pre
M (SD)		 Post
M (SD)		 Cohen’s d
[95% CI]		 Pre
M (SD)		 Post
M (SD)		 Cohen’s d
[95% CI]		 Group
p-value		 Time
p-value		 G × T
p-value
IFIS_GenFit 2.3
(0.6)		 2.3
(1.3)		 0.00
[-1.13, 1.13]		 2.6
(0.7)		 3.4
(0.8)		 1.46
[-2.54, -0.34]		 2.3
(0.5)		 3.0
(0.9)		 0.77
[-1.50, -0.00]		 0.214 0.057 0.385
IFIS_CRF 1.7
(0.6)		 2.5
(1.3)		 0.32
[-1.46, 0.88]		 2.3
(0.7)		 3.3
(0.8)		 2.27
[-3.70, -0.80]		 2.1
(0.9)		 2.9
(0.9)		 0.71
[-1.43, 0.04]		 0.362 0.006 0.917
IFIS_MusStr 2.3
(0.6)		 3.0
(0.8)		 1.16
[-2.64, 0.44]		 2.3
(0.5)		 3.4
(0.5)		 3.02
[-4.83, -1.19]		 2.1
(0.6)		 3.1
(0.9)		 1.16
[-1.99, -0.29]		 0.742 0.000 0.564
IFIS_Spd/Agl 2.0
(0.0)		 2.3
(0.5)		 0.58
[-1.77, 0.72]		 2.0
(0.8)		 2.9
(0.7)		 0.80
[-1.64, 0.09]		 1.7
(0.7)		 2.4
(1.0)		 1.17
[-2.01, -0.29]		 0.484 0.006 0.571
IFIS_Flex 1.7
(0.6)		 2.5
(1.0)		 1.00
[-2.39, 0.51]		 1.8
(0.9)		 2.4
(0.8)		 0.34
[-1.09, 0.44]		 2.2
(0.8)		 3.3
(0.9)		 1.42
[-2.35, -0.46]		 0.113 0.002 0.751
High-intensity functional training (HIFT). One-day per week (HIFT1). Two-days per week (HIFT2). Three-days per week (HIFT3). International Fitness Scale (IFIS). General fitness (GenFit). Cardiorespiratory fitness (CRF). Muscular strength (MusStr). Speed and agility (Spd/Agl). Flexibility (Flex). Group by time interaction (G×T).