kettlebells were used before, there was shortage of decent equipment.
dunno about wrestling but here min requirements for candidates in sambo national teams, so you will have a general idea
Weight category: 63, 70, 80, 93, 93+ kg
Strenghth
1. pull ups: 28, 26, 25, 24, 18 reps
2. Cleans: 90, 100, 115, 125, 130 kg
3. Squats with bodyweight barbell OR partner on your shoulders(same weight category)!: 40, 40, 40, 40, 35 reps
4. Dunno how u call it, olympic movement, barbell press standing above your head: body weight + 30 kg
Speed.
1. Running 30m 4.3, 4.2, 4.1, 4.1. 4.2 sec
2. Running 30m (3 interwals 10m each back and forward): 7.3, 7.3, 7.1, 7.1, 7.3 sec
3. Long jump from standing 276+-6 cm for all weight categories
Endurance.
1. Running 3km (min): 11.0, 11.0, 11.0, 11.15, 11.30
2. have no idea how to translate so skip it : 50, 50, 50, 47, 45
3. Pulling youself on the 5m rope, 3 times without rest
4. Sparring for 15 min with partener change: have to get 5 points or more.
once again those just min norms to qualify, i knew some people who were running 10km every time before training just for warm up easily.