In this 2010 post on AdamsDrafting I considered use of aggressively as an unhelpful alternative to reasonable efforts.
Well, in the same vein I now offer you … strive! Three examples:
CNH Capital shall strive to respond to credit applications within two (2) weeks following receipt of all requested information and material.
During the Employment Period, Executive … (iv) shall perform Executive’s duties and responsibilities hereunder to the best of his abilities in a diligent, trustworthy, businesslike and efficient manner and shall strive to promote the success and best interests of the Entities.
Both Buyer and Seller shall strive to achieve a 100% service level.
Although I like its Horatio Alger vibe, I say ixnay to strive.