Homemade Gym Stuff Tyres & Sledgehammers: a different approach.

So we know that the ol' tyre can be filled with concrete:

A la DaveDrapers Site

One problem we've come across is 'bounce & creep' of medium sized tyres (tires) when used for 'hammering...one solution is to fill the tyre, still on the rim, with concrete or
even better/easier use sand. This not only solves the B&C but also changes the dynamics of the exercise - negating the hammer-bounce and adding in both a full concentric lift and a plyometric 'stop'. It also means you don't need to destroy tree stumps or the lawn...& they're stackable!

Light Sledge - No bounce, faster hits - GPP

Med-Heavier Sledge - No bounce, Con/Ecc - SPP

Heavy Sledge - No bounce, Con/Ecc - 'proper workout' for sets

Some technical blurb on the plyometric effect: 

"When the stretch-shortening cycle and a plyometric effect are used to increase the force of contraction, an eccentric contraction precedes a concentric contraction. The ability to use this effect relies on an athlete’s ability to suddenly stop the eccentric contraction and immediately initiate the concentric contraction. The faster one stops or absorbs force, the quicker force can be generated in the opposite direction. Paramount is the ability (in strength, movement and balance) to instantaneously couple the end of the eccentric phase with the beginning of the concentric phase.

The plyometric effect of conditioning is intended to help bridge the gap between strength and speed. Plyometric exercises increase amplitude and velocity of movements by accentuating the eccentric phase of muscle contraction. They also stimulate more intense demands on the neuromuscular system and the stretch-shortening cycle, thereby stimulating the development of faster, more efficient coupling mechanisms in the body to net powerful concentric contractions (Baechle & Earle 2000). "

Go Bash!  - Homemade Gym Stuff
 

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