What does it means to scramble and strain up a mountain?

The phrase "scramble and strain up a mountain" means to climb a mountain with difficulty, using both hands and feet and exerting a lot of physical effort. It suggests a challenging and strenuous ascent, where the climber may need to scramble over rocks or other obstacles and use all their strength to pull themselves up steeper sections. This phrase is often used to describe mountaineering or hiking in rugged terrain.