Golden Rule of Tapering
From Running tips for everyone from beginners to racing marathons and ultramarathons
My golden rule of tapering...
Only run at race pace or faster during the taper period
Everything else flows from this - Practical Tapering Tapering 101 & Tapering Tips
Tapering is all about recovering and healing. The benefits of longer, slower running to build endurance will not be realized within the taper period. It's okay to do a warm up at a slower pace, or to take walking breaks between intervals.