The cooldown following a sprint workout looks a little different than that of an endurance or conditioning session. It's conventional in many workout forms to add in several additional sets of submaximal intervals, a steady-state burn, or extensive lifting. That's fine when doing a blended session but adding a lot of extra training to a pure speed workout can make it excessively fatiguing. This can be counterproductive. It's very tempting for Lifetime Athletes to want to pile on some additional work because they didn't feel like they did quite enough. Ofen this results in a major "I didn't just work out...I got worked over" experience.
Many times the speed workout will leave you feeling more exhilarated than exhausted (if we do it right). As long as things didn't get too anaerobic and acidic (there is a place for those types of workouts...just not so much right here and right now), you shouldn't feel wasted. You have to learn to feel satisfied with that main set and call it good. Don't try to do too much on any one day.
I usually recommend some purposeful resistance training after a sprint set. We can work muscles and movement patterns that have specific relationship to the sprint training. This might look like some sets of a compound lift such as deadlifts, squats, or lunges followed by couple accessory exercises and a bit of mobility work. A little walking, jogging and stretching can occasionally be incorporated here, as well as a cold plunge, tissue work, and hydration/replenishment beverages.
The key is to get in some speed stimuli, then wind down the CNS, lower the heart rate and core temperature, and let the body get started on the recovery process. In reality, the back side of a speed workout should be quite a bit shorter than the front side (warmup and progressive activation).
It takes some getting used to this approach, but with a little practice, you'll see outstanding results from the appropriate finale to your speed training.