I would like to make a few new purchases of equipment that are tried and true (no gimmicky or trendy pieces). I currently have dumbbells, kettlebells, medicine balls, battling ropes, TRX, BOSU, resistance bands, hurdles, gliding discs, and barbells, and boxing gloves/mitts. Any other suggestions? (Would also like to know if anyone uses the Vipr and if it’s worth the investment). Thanks!