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ArboristSite Operative
Altho I do almost all my splitting hydraulically, I do have a Fiskars 8 lb. isocore, and that thing is sweet. Wish I'd had one back in the day. I split everything by hand for 40-plus years. Got so tired of replacing wood handles that I welded a steel handle on my maul back in the '80s. That thing was hard on the hands, but it stood up to years of abuse.
The key to swinging a maul (same with an axe) is to get the momentum of a a full-round swing through centrifugal force. In other words, bring it around behind you so the head travels in a full circle. If you lift it in front of you and bring it down, you'll be worn out in no time.
Actually I only split by hand, and I have the Friskars Isocor and splitting axe, I wanted something less contemporary to fit my generation. The Friskars work but it's like new motorbikes compared to my 45 year old Bonneville. The vintage never grows old.