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22 Dec, 2020
Teh spring is the secret to gaining amzzing strength. Traditional isometrics are limited because progress is difficult to measure.
1 of 2 found this helpful Much like Bully Xtreme. very stiff resistance. You must warm up before trying isotonics. very well made and as good a quality as the bullyxtreme for a fraction of the price. Useful to combine with calisthenics or take to weight room with you for added power in your lifts.