Sweating

We remove toxins when we sweat. We remove more during activity than just sweating in a sauna. Some toxins may be more easily removed through sweat vs. blood or urine.

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EXCRETION OF Ni, Pb, Cu, As, AND Hg IN SWEAT UNDER TWO SWEATING CONDITIONS
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​Physiologists have long regarded sweating as an effective and safe means of detoxification, and heavy metals are excreted through sweat to reduce the levels of such metals in the body. The results demonstrated that the sweating method influenced the excretion of heavy metals in sweat and, as hypothesized, the concentrations of Ni, Pb, Cu, and As were significantly higher during dynamic running than during sitting in the sauna.

Kuan, Wen-Hui et al. “Excretion of Ni, Pb, Cu, As, and Hg in Sweat under Two Sweating Conditions.” International journal of environmental research and public health vol. 19,7 4323. 4 Apr. 2022, doi:10.3390/ijerph19074323

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BLOOD, URINE, AND SWEAT (BUS) STUDY: MONITORING AND ELIMINATION OF BIOACCUMULATED TOXIC ELEMENTS

Many toxic elements appeared to be preferentially excreted through sweat. Presumably stored in tissues, some toxic elements readily identified in the perspiration of some participants were not found in their serum. Induced sweating appears to be a potential method for elimination of many toxic elements from the human body. Biomonitoring for toxic elements through blood and/or urine testing may underestimate the total body burden of such toxicants. Sweat analysis should be considered as an additional method for monitoring bioaccumulation of toxic elements in humans.
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Genuis, Stephen J et al. “Blood, urine, and sweat (BUS) study: monitoring and elimination of bioaccumulated toxic elements.” Archives of environmental contamination and toxicology vol. 61,2 (2011): 344-57. doi:10.1007/s00244-010-9611-5

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ARSENIC, CADMIUM, LEAD, AND MERCURY IN SWEAT: A SYSTEMATIC REVIEW
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This article reviews 24 studies that examine the relationship between sweat and heavy metals.  One study even measured the sweat accumulated in the feet of rubber chest waders.

Sears, Margaret E et al. “Arsenic, cadmium, lead, and mercury in sweat: a systematic review.” Journal of environmental and public health vol. 2012 (2012): 184745. doi:10.1155/2012/184745