Water striders from the family Gerridae are infamous animals for their ability to skate on the waters surface, making them pleuston (surface-living) animals. Their entire bodies are waterproofed by hydrophobic hairs (hydrofuge) that keep water from sticking to them and create small pockets of air on their long feet. Thanks to this and their middle legs like oars, they can stride on the waters surface or jump off it like a trampoline. They mainly hunt waterlogged animals, impaling them with their proboscis and ingesting the insides.
The question is what if they were bigger? About horse sized or perhaps smaller? Small animals often use weak-forces to their advantage, for them physics are different so not all their adaptations translate well to larger sizes. Hydrofuge would be useless for such a large animal, so I take it they'll use a different tactic. Either large dense tufts of waterproof fur on their feet or balloon like organs? They would still use a pair of legs for paddling but could they do so with long thin legs, or should they be shorter and stubbier? Could they jump off the water?
How would they efficiently skate on the waters surface?