Stadiums vs Hill Repeats
Running has many forms of self-imposed discomfort, two of which are hill repeats and 'stadiums', e.g. running up and down hills or stadium steps. So which one is better (i.e. most worth the suffering)? Though often the answer is a bit of both, as variety is indeed a key component to full development, in this case there is a clear winner, hill repeats. Here are two primary reasons...
The benefits of both can be profound, most importantly the strengthening of hip flexor, glute and hamstring muscles, though for the full benefit of such high energy output, hill repeats is the preferred method of training/torture.