A daily switch between SPY (stocks) and BIL (cash‑like T‑bills) using bond momentum as a thermometer: if 7–10yr Treasuries (IEF) show stronger recent strength than T‑bills, go into SPY; otherwise hold BIL.

Each day it looks at two bond funds: BIL (very short‑term T‑bills) and IEF (7–10 year Treasuries). It gives each a “recent strength” score (RSI, a 0–100 gauge of how strong the latest price moves are). If IEF’s score is higher than BIL’s, it buys the S&P 500 (SPY). Otherwise it sits in BIL. It rechecks daily and switches as needed.

Out-of-sample data show near-zero SPY beta, strong risk-adjusted returns, and minimal drawdowns. The RSI-based bond momentum rotates into SPY only when favorable, offering capital protection and diversification versus the S&P 500.