"positively challenge" is correct and usable in written English.
You could use this phrase to describe an action, or to communicate an attitude or approach. For example: "The manager encouraged the team to positively challenge each other's ideas."
However, it is also true that others perceive the speed to be adequate and positively challenging.
Doctors (Table 1) felt positively challenged as role models, almost never felt disturbed and were positively motivated by a student's presence.
The physical therapists found the experience of working with the musician population rewarding and that it positively challenged their knowledge and clinical reasoning skills.
Because growth forecasts become relatively so much more important to stock investors during bubbles, companies have their greatest incentive to spin news positively and challenge bad news during periods of stock market euphoria.
Its goal is to help you learn to think more positively and challenge negative thoughts and behaviors.
Demands which are sufficiently met by available resources (both internal and external) are perceived positively as challenges; those which outstrip available resources are perceived as threats.
Apart from a negative experience due to increased stress levels, the transition period can also be interpreted positively as challenging, full of learning opportunities and opportunities for high performance [ 5].
Mr. Haimovitz, a musician who positively thrives on challenge, gave a gripping account.
Peaty positively loves a challenge and is responsible for six of the 10 fastest times in his specialist event.
The students will respond positively to the challenge and it will help to curb any bad behaviour.
