An odd word to find an image for when you start thinking about it. Strength is a noun but not in the way soap or sausage is. Do you know what I mean.
As I have no rippling muscles to show you I have gone instead for strength of colour.
Stone, sky and parasol
Taken a few years ago near Toulouse, the sunlight was strong and bright and I liked the strength of colour thanks to the Summer sunhine.
The photo challenge is hosted by Sandra at https://daffodilwild.wordpress.com
Take a look at her lovely blog to see what other participants have thought of to demonstrate the word ‘strength’.
digwithdorris.com 
Great contrasts.
I think blue and orange are opposites on the colour wheel, that’s probably why they work?
That’s what people say. I never understood the color wheel. I just know I like those colors when I see them together.
Trust your instinct, you’re not wrong
Strong image, strong colours = perfect for the challenge. Thank you for your kind words Dorris! ❤
What an eye you have. Those colours are really dramatic.
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That is strength of colour Doris against the background, great image
Thanks Denis.
Orange and blue are strong colors on their own, together each is intensified. Interesting and strikingly beautiful illustration!
Thank you. They certainly caught my eye