It is defined as "the capacity [maximum amount that can be contained] to resist strain or stress".
Strength is what each person strives to achieve as we journey through life with varying forms of what the end goal is.
If you have been exposed to the fitness world in any form you will note the truth in that statement. The fitness industry has put out products for "strength" such as Dancing to the Oldies with good ol' Richard Simmons, Denise Austin's Buns of Steele, to today's Crossfit and HIIT programs.
Despite these diverse avenues to achieve "strength", there is one key factor that must be applied.