Coggan: 7 zones from Active Recovery to Neuromuscular. Seiler: 3 zones separated by VT1 and VT2. Both require accurate testing. Neither is wrong — they serve different philosophies. The key is consistent testing and honest zone adherence.
Coggan: 7 zones from Active Recovery to Neuromuscular. Seiler: 3 zones separated by VT1 and VT2. Both require accurate testing. Neither is wrong — they serve different philosophies. The key is consistent testing and honest zone adherence.