High-Intensity Functional Training (HIFT): Definition and Research Implications for Improved Fitness

Area of Science:

• Exercise Physiology
• Sports Science
• Fitness Training

Background:

• High-intensity functional training (HIFT) involves functional, multi-joint movements adaptable to all fitness levels, promoting superior muscle recruitment compared to traditional exercises.
• HIFT is often confused with high-intensity interval training (HIIT), but differs in its constantly varied functional exercises and variable activity durations, with or without rest periods.

Purpose of the Study:

• To establish a working definition for High-intensity functional training (HIFT).
• To review existing literature on HIFT's impact on metabolic and cardiorespiratory adaptations.
• To provide a framework for future research evaluating HIFT's health and fitness outcomes.

Main Methods:

• Literature review of studies investigating High-intensity functional training (HIFT).
• Analysis of exercise characteristics differentiating HIFT from High-intensity interval training (HIIT).
• Synthesis of current evidence on HIFT's effects on metabolic and cardiorespiratory health.

Main Results:

• High-intensity functional training (HIFT) demonstrates potential for enhanced muscle recruitment.
• While High-intensity interval training (HIIT) research is extensive, data on HIFT's specific adaptations is less developed.
• HIFT utilizes varied functional movements and durations, distinguishing it from HIIT's structured intervals.

Conclusions:

• A clear definition of High-intensity functional training (HIFT) is needed to guide future research.
• Further investigation into HIFT's metabolic and cardiorespiratory benefits across diverse populations is warranted.
• Standardizing HIFT research will enable more effective evaluation of its impact on health and fitness.