How to make your muscles denser without increasing muscle mass

10 Ways to Build Strength Without the Size

Lift Heavy. Lifting heavy (> 90% 1RM) will improve strength by recruiting what are called high-threshold motor units.

...Lift Explosively.

...Do Plyometrics.

...Slash the Volume.

...Use Sprints and Drills.

...Try Contrast Training.

...Rest Longer.

...Hit Weak Links.

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the correct answer is 2 and 4