toughening process
toughening agent
toughening treatment
toughening method
toughening effect
toughening procedure
toughening mechanism
toughening strategy
toughening technique
toughening solution
he is toughening his mind through meditation.
toughening the material makes it more durable.
she believes in toughening her body with regular exercise.
toughening up is essential for overcoming challenges.
the coach emphasized toughening the team's defense.
they are toughening the regulations to ensure safety.
toughening your resolve can lead to success.
he is toughening his skin by spending time outdoors.
the program focuses on toughening students' problem-solving skills.
toughening the training regimen improved their performance.
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