Rock climbing is great exercise, but not very balanced. Climbing really works the forearm muscles that are involved in grip, the biceps and lats, the quads and gastroc/soleus, but neglects a lot of the other muscles. This imbalance can lead to injury and/or other issues. You could market your training programs to address these imbalances. Also I would recommend that you watch other rock climbers as they climb to see if you can be inspired in how you can help them climb better. If you are a climber yourself, you should focus on your own experience as you climb. Where are you feeling the most fatigue? What is the biggest challenge conditioning wise? etc.