The standards have always allowed for lots of variety. Kettlebells, suspention systems, stability balls, and steps. However, There are 1/4″ – 2 1/2″ elastic (rubber) bands that have changed my clients pull up routines forever. I posted a link but they are probably in that PS catalog. Careful, I’ve noticed Power Systems produces ‘some’ sub-standard products that are cheaply made and wear out quick. Those bands have stood the test of time though. Think I got them through perform better (who isn’t much better in the quality department, really check into what you are getting).
Guess they don’t have th 1/4′ on this site but, I got one so they’re out there.
A common problem is that people get training ADD and don’t stick with anything long enough for any REAL training progress. A barbell and 3-6 exercises done 3x per week can yield unbelievable progress for up to two years. With that being said don’t get caught up in the latest fitness toys, there is no need for a lot of toys, put that money into marketing and be the best at using what is available.
The jungle gym, bands, the power wheel (straps to your feet), and Kettlebells are your best bets for outdoors and indoors.
Bands, ball, jump ropes, ladders if you’re training on a budget. In a gym, if the gym owners are paying for it..unlimited opportunities!! My favorite company is www.funfitpro.com based in Colorado.