to struggle vs to strain vs to strive

TO STRUGGLE = [intransitive] to try extremely hard to achieve something, even though it is very difficult [= to strive]

• Excellent Work! You rocked this test and it was a breeze for you, most people struggled but not you.
• If you’re here to help others, be patient and welcoming. Offer support if you see someone struggling or otherwise in need of help. [Code of Conduct - Stack Overflow]

struggle to do something
• I'm really struggling to get out of bed
• Russia’s Navy is more rust than ready: Moscow struggles to keep its fleet afloat

struggle with
• Two people who I love very much are struggling with weight loss.
• Low blood levels of Omega-3 could explain why some children struggle with reading.
• Scope is one of the foundational aspects of the JavaScript language, and probably the one I’ve struggled with the most when building complex programs.

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TO STRAIN (transitive and intransitive) = to try very hard to do something using all your strength or ability.

• Poor posture during the day may be related to musculoskeletal injury. To combat this, make sure your computer screen is positioned in a way that you're not straining or hunching to see it.

strain (something) to do something
• I was straining to lift my arm with biceps
• I was straining to induce a bowel movement, when I suddenly felt a sharp pain in the middle of my chest.

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TO STRIVE STROVE STRIVEN (formal) = to make a great effort to achieve something

• This web site strives to evolve with technology and respond to reader preferences for news delivery.
• We strive to offer users a great experience and make Firefox available across many platforms, devices and operating systems [Vice President of Product, Firefox at Mozilla]

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TO ENDEAVOUR [intransitive] (formal) /ɛnˈdɛv ər/ = to try very hard

endeavour to do something
• We always endeavor to please our customers.
• Despite the fact that HTML5 is not yet completed, you can safely take advantage of the new features of the language as long as you endeavour to ensure that users with older browsers will be able to view your pages.