File:Petrov and Boshirov map.jpg

Summary
Map shows Alexander Petrov and Ruslan Boshirov's movement on the day of the poisoning

Number 2 on the map is the The Monster Factory gym.

Hat tip Michael Kobs


 * Source
 * First chilling CCTV of the two Russian novichok assassins in Salisbury - Daily Mail Online, September 7, 2018

The Monster Factory gym
The club has a Facebook page. Claimed location is here, just off the Wilton Rd corner, on New Zealand Ave. Google gives the location of the club as 92 New Zealand Ave; such number does not exist.