You can run of an evening. I live in a semi-tropical area, often in a full tropical area and I have always been able to run at night. Sit-up, crunches, push-ups and similar are easy. A set of dumbbells and one of those old fashioned “Bullworkers” from eBay can match most of the more elaborate gym equipment in a pinch. When I am traveling and away from my own gym, that is what I take.