Types - Strength training/weights

There's aerobic/cardio, strength training/weights, flexibility and stretching, high-impact interval training, CrossFit, and more. 
- Strength training/weights. This is easier than it sounds.  Don't buy anything.  Use your weight to start:
     - Push Ups: 3 sets of 15
     - Squats: 3 sets of 15
     - Planks: 3 sets of 15
     - Sit Ups: 3 sets of 15