I'm going to travel to Russia.
We have a tour guide, but we have some times for our own.
Can we enjoy sport clubs (bungee, flyboarding etc.) without knowing Russian?
I'll confirm what people have already basically said in the comments:
Having said that, there are definitely people whose English is decent. Also, gestures / non-verbal communication can get you far. My advice is this: If you can't find an activity operator that speaks English, try to book activities in large groups (to increase the chance that one of the other participants will be an English-speaker), and avoid activities where you'll require a lot of instruction.
I'm just going to speak from my own experience while I was traveling in St. Petersburg and Moscow. Granted, I didn't go outside of the cities. I found that both areas I get by with English and people are friendly. While I was walking in local farmer market trying to buy fruits, the people there didn't speak English but we were able to communicate with hand gestures and I was able to get what I want.
I took a taxi and even buses and people around me helped me talking to the driver and called me to the stop I wanted.