The phrase "a challenge to maintain" is correct and usable in written English.
You can use it when discussing difficulties in keeping or sustaining something, such as a standard, a relationship, or a condition.
Example: "In a fast-paced work environment, a challenge to maintain productivity can arise when team members are overwhelmed with tasks."
Alternatives: "a struggle to uphold" or "a difficulty in sustaining".
Temperatures are warm and humidity rises, making it a challenge to maintain a smooth playing surface.
But she said it would be "a challenge to maintain this level of growth in the longer term".
As a chair, it can be a challenge to maintain this delicate balance while pursuing expertise, networks and commitment.
Mr. Sabourin said it was a challenge to maintain the simplified fare structure while still offering frills to customers -- food, for instance -- and operating from major airport hubs.
Requiring no corset, the dress implies freedom; in its starched purity, it suggests a challenge — to maintain a ruthless honesty with herself and with the world.
That gives you a little bit of a challenge to maintain what you're doing so they keep looking at you in the same way".
However, focal plane movement due to breathing artifact and RF-field-induced thermal expansion of tissue presented a challenge to maintaining imaging of the same structures through duration of the video and such movements may certainly have changed the tumor surface orientation significantly at various time points, making the above issues relevant.
Frequent power outages posed a challenge to maintaining the cold chain, properly storing specimens and reagents, and performing the onsite serological tests.
A trend toward frequent, informal, internal evaluations means that rigor is decreased; this decrease in rigor and shift toward informality has been recognized as a challenge to maintaining the value of program evaluation across all types of organizations (Roch & McNall, 2007).
Anne Maniglier, a French photographer involved in the project, said: "There was a great tension at first, as the Turkish flotilla had just been attacked by the Israeli Army, and it was a real challenge to maintain a curatorial and artistic thought in such a moment".
