Physics is a fortiori an experimental subject. Take away the experiments and one is left with mathematics; and the mathematics, however beautiful, may not necessarily relate to the real universe that physicists endeavour to describe. That is why all undergraduate students of physics, even aspiring theorists, are at some stage expected to undertake laboratory experiments.
Review of "Experimental Physics: Modem Methods" by R. A. Dunlap, Oxford University Press, 1988, pp. 377.