In reply to Flatus Vetus:
Be specific in what you want to achieve, then do the research on how you want to get there.
Be wary with including targets such as activities that include new or refining complex skills such as climbing, ski mountaineering etc, as improvement will be the sum of a large number of different factors of which you may not be able to control inside your work gym.
Your quickest path to improvement will always be to work your weaknesses.