What is actually a Heavy Duty Training and a HIIT Training ? Why HIIT not HIT ?

Heavy Duty Training is a heavy weight or load training with maximum 10 reps and minimum 6 reps to impose extra torque to muscles. HIIT is a bit different. Actually it happens when you push yourself beyond heavy duty training, that means, above 10 reps to fatigue for maximum effect. It means you have to put more ‘effort’ in terms of putting more ‘speed’ and ‘vigor’ to your workout performance. Effort here doesn’t holds general meaning nor it means you have to ‘intensity’ your effort haphazardly to endure more reps.  Intensity here means intensifying your speed and vigor which needs extra effort and thus endures ‘high reps’ automation. 

HIIT is been often misunderstood with HIT. The difference with letter ‘I’ suggests ‘rest intervals’ are necessary for enough oxygen compensation and energy for further workout. HIT by that meaning will impose you to more lethargic side and may pack a lot of health complications and weaknesses with time even in clusters. So, HIIT with rest periods or intervals between sets is a better idea of generating more speed and vigor to your exercise thus intensifying your workout performance and endure high reps automation.