x1=c1 climbs/[goes up/ascends] upwards on wall/fence/mountain/boulder/obstacle x2=c2 using x3=c4 [limbs/tools/equipment] towards top/summit x4=g1 from base/floor/baseline/standard height x5=g3.
From galtu cpare. Narrows down cpare to only mean climbing and upwards, against the gravitational pull (the frame or reference). For surface of x2, see/use sefta.