This is a 1935 painting called Maruja the Strong, depicting "a semi-naked young woman demonstrating her incredible strength to a group of Spanish peasants. The fact that she can lift, outstretched from her arms, what we perceive as full jugs of water, denotes not only her strength, but also her beauty and vigor.
The title, Maruja the Strong, is a play on words, as Maruja is not only a variant of the female name Maria, but is also a slang word in Spanish for 'good wife'."
And for the fans of the art, below is the study sketch for Maruja.
And a similar sketch of 'peasant' women.