Structurally stanozolol is not capable of converting into estrogen. Likewise an antiestrogen is not necessary when using stanozolol, gynecomastia not being a concern even among sensitive individuals. Since estrogen is also the culprit with water retention, instead of bulk produces a lean, quality look to the physique with no fear of excess subcutaneous fluid retention. This makes Winstrol a favorable steroid to use during cutting cycles, when water and fat retention are a major concern. This drug is also very popular among athletes in combination strength/speed sports such as Track and Field. In such disciplines one usually does not want to carry around excess water weight, and may therefore find the raw muscle-growth brought about by Winstrol quite favorable over the lower quality mass gains of more estrogenic agents.