A buddy and I went in together on this:
https://www.torquefitness.com/tank-all- ... gICy_D_BwE
It's a wheeled push/pull device that uses a magnetic reduction system to provide drag. So if any of you have gotten into sled pulling and dragging with a typical sled you know what you're dealing with e.g. noise, wear, lugging weights around etc. This device makes it simpler but it is expensive.
I just thought I'd share a brief wth effect with this thing. I've done about a half dozen workouts with it ranging from 45 minutes to finisher type stuff after a weight workout of around 20 minutes. Multiple reps of pushes and pulls of about 60 yards round trip. Besides a neutral setting, the device has 3 resistance modes, 1-2-3 and the faster you push it the harder the resistance. Weight can be added to it but it's only for stability i.e. if you're a tall guy pushing high on the bars you can lift the back end up if you're pushing it hard and conversely you can lift it up if you're pulling backwards.
My personal experience with this thing is it's just simply brutal but recovery is fast. I have pushed it fast on the lower resistance and I've grinded it out on the higher resistance levels and everything in between. I don't know if I've felt the level of full body fatigue as quickly doing anything else but as I previously said, the recovery is relatively rapid so around two minutes after a trip I could do it again. On the longer sessions I would just keep doing it and mixing up the speed/resistance until I felt a noticeable drop off in strength/speed then I'd stop.
So to get to the point, I went for a bike ride one day last week on a single speed bike I have. I rode for about an hour and I covered every hilly portion that is in my immediate area. What I noticed was a sense of increased leg power and turnover on the hill portions. There were several portions I climbed with no noticeable increase in heart rate. The only thing that's been added to the mix is pushing/pulling this device. I'm going to try this weekend to do a longer ride on a geared bike with all the shit I've accumulated e.g. power meter, gps, hr monitor and compare it to a previous ride around 30 miles, and see what's up. I may be captain obvious but thoughtful and consistent pushing and pulling could add some clear positives to leg strength and strength endurance with limited risk and little disruption to whatever routine you may be following. I'm just sharing you dirty bastages!!