WARM UP: -10 minutes gradually progressing from Active Recovery zone to Endurance zone. -3x 1 minute Spin Ups (110+ RPM) @Threshold zone+, 1 minute easy. -5 minutes easy ——— MAIN SET: -4x 15 minutes alternating between 2 minutes @85% FTP, and a 30 second surge effort (110+ RPM) @105% FTP. ——— COOL DOWN: -4 minutes gradually reducing from Endurance zone to Active Recovery zone